Common use of HVAC Clause in Contracts

HVAC. A. Heating, ventilating and air conditioning equipment will be provided with sufficient capacity to accommodate a maximum population density of one (1) person per one hundred fifty (150) square feet of useable floor area served, and a combined lighting and standard electrical load of 3.0 xxxxx per square foot of useable floor area. In the event Tenant introduces into the Premises personnel or equipment which overloads the system’s ability to adequately perform its proper functions, Landlord shall so notify Tenant in writing and supplementary system(s) may be required and installed by Landlord at Tenant’s expense, if within fifteen (15) days Tenant has not modified its use so as not to cause such overload. Operating criteria of the basic system shall not be less than the following: (i) Cooling season indoor temperatures of not in excess of 73 - 79 degrees Fahrenheit when outdoor temperatures are 91 degrees Fahrenheit ambient. (ii) Heating season minimum room temperature of 68 - 75 degrees Fahrenheit when outdoor temperatures are 6 degrees Fahrenheit ambient. B. Landlord shall provide heating, ventilating and air conditioning as normal seasonal changes may require during the hours of 8:00 a.m. to 6:00 p.m. Monday through Friday (legal holidays in all cases excepted). If Tenant shall require air conditioning (during the air conditioning season) or heating or ventilating during any other time period, Landlord shall use landlord’s best efforts to furnish such services for the area or areas specified by written request of Tenant delivered to the Building Superintendent or the Landlord before 3:00 p.m. of the business day preceding the extra usage. Landlord shall charge Tenant for such extra-hours usage at reasonable rates customary for first-class office buildings in the Boston Suburban market, and Tenant shall pay Landlord, as Additional Rent, upon receipt of billing therefor.

HVAC. A. Heating, ventilating and air conditioning equipment will be provided with sufficient capacity to accommodate a maximum population density of one (1) person per one hundred fifty (150) square feet of useable floor area served, and a combined lighting and standard electrical load of 3.0 xxxxx per square foot of useable floor area. In the event Tenant introduces into the Premises personnel or equipment which overloads the system’s 's ability to adequately perform its proper functions, Landlord shall so notify Tenant in writing and supplementary system(s) may be required and installed by Landlord at Tenant’s 's expense, if within fifteen (15) days Tenant has not modified its use so as not to cause such overload. Operating criteria of the basic system are in accordance with the Massachusetts Energy Code and shall not be less than the following: (i) Cooling season indoor temperatures conditions of not in excess of 73 - 79 78 degrees Fahrenheit when outdoor temperatures conditions are 91 degrees Fahrenheit ambientdrybulb and 73 degrees Fahrenheit wetbulb. (ii) Heating season minimum room temperature of 68 - 75 72 degrees Fahrenheit when outdoor temperatures conditions are 6 degrees Fahrenheit ambientdrybulb. B. Landlord shall provide heating, ventilating and air conditioning as normal seasonal changes charges may require during the hours of Normal Building Operating Hours (8:00 a.m. to 6:00 p.m. p.m., Monday through Friday (Friday, and 8:00 a.m. to 1:00 p.m. on Saturdays, legal holidays in all cases excepted). If Tenant shall require air conditioning (during the air conditioning season) or heating or ventilating during any other time periodseason outside Normal Building Operating Hours, Landlord shall use landlord’s 's best efforts to furnish such services for the area or areas specified by written request of Tenant delivered to the Building Superintendent or the Landlord before 3:00 p.m. of the business day preceding the extra usage. Landlord shall charge Tenant for For such extra-hours usage at reasonable rates customary for first-class office buildings in the Boston Suburban marketservices, and Tenant shall pay Landlord, as Additional Rentadditional rent, upon receipt of billing thereforbilling, a sum equal to the cost incurred by Landlord.

HVAC. A. Heating, ventilating and air conditioning equipment will be provided with sufficient capacity to accommodate a maximum population density of one (1) person per one hundred fifty (150) square feet of useable floor area served, and a combined lighting and standard electrical load of 3.0 6.0 xxxxx per square foot of useable floor area. In the event Tenant introduces into the Premises personnel or equipment which overloads the system’s ability to adequately perform its proper functions, Landlord shall so notify Tenant in writing and supplementary system(s) may be required and installed by Landlord at Tenant’s expense, if within fifteen (15) days Tenant has not modified its use so as not to cause such overload. Operating criteria of the basic system shall not be less than the following: (i1) Cooling season indoor temperatures temperature of not in excess of 73 - 79 degrees Fahrenheit when outdoor temperatures are temperature is 91 degrees Fahrenheit ambient. (ii2) Heating season minimum room temperature of 68 - 75 degrees Fahrenheit when outdoor temperatures are temperature is 6 degrees Fahrenheit ambient. B. Landlord shall provide heating, ventilating and air conditioning as normal seasonal changes may require during the hours of Normal Building Operating Hours (8:00 a.m. to 6:00 p.m. p.m., Monday through Friday (Friday, legal holidays in all cases excepted). If Tenant shall require air conditioning (during the air conditioning season) or heating or ventilating during any other time periodseason outside Normal Building Operating Hours, Landlord shall use landlord’s best efforts to furnish such services for the area or areas specified by written request of Tenant delivered to the Building Superintendent or the Landlord before 3:00 p.m. of the business day preceding the extra usage. Landlord shall charge Tenant for For such extra-hours usage at reasonable rates customary for first-class office buildings in the Boston Suburban marketservices, and Tenant shall pay Landlord, as Additional Rent, upon receipt of billing thereforbilling, a sum equal to the cost incurred by Landlord.

HVAC. A. Heating, ventilating and air conditioning equipment will be provided with sufficient capacity to accommodate a maximum population density of one (1) person per one hundred fifty (150) square feet of useable floor area served, and a combined lighting and standard electrical load of 3.0 xxxxx per square foot of useable floor area. In the event Tenant introduces into the Premises personnel or equipment which overloads the system’s ability to adequately perform its proper functions, Landlord shall so notify Tenant in writing and supplementary system(s) may be required and installed by Landlord at Tenant’s expense, if within fifteen (15) days Tenant has not modified its use so as not to cause such overload. Operating criteria of the basic system are in accordance with the Massachusetts Energy Code and shall not be less than the following: (i) Cooling season indoor temperatures of not in excess of 73 - 79 degrees Fahrenheit when outdoor temperatures are 91 degrees Fahrenheit ambient. (ii) Heating season minimum room temperature of 68 - 75 degrees Fahrenheit when outdoor temperatures are 6 degrees Fahrenheit ambient. B. Landlord shall provide heating, ventilating and air conditioning as normal seasonal changes may require during the hours of 8:00 a.m. to 6:00 p.m. Monday through Friday (legal holidays in all cases excepted). If Tenant shall require air conditioning (during the air conditioning season) or heating or ventilating during any other time period, Landlord shall use landlord’s best efforts to furnish such services for the area or areas specified by written request of Tenant delivered to the Building Superintendent or the Landlord before 3:00 p.m. of the business day preceding the extra usage. Landlord shall charge Tenant for such extra-hours usage at reasonable rates customary for first-first class office buildings in the Boston Central Suburban market128 Market, and Tenant shall pay Landlord, as Additional Rent, upon receipt of billing therefor.

HVAC. A. Heating, ventilating and air conditioning equipment will be provided with sufficient capacity to accommodate a maximum population density of one (1) person per one hundred fifty (150) square feet of useable floor area served, and a combined lighting and standard electrical load of 3.0 xxxxx per square foot of useable floor area. In the event Tenant introduces into the Premises personnel or equipment which overloads the system’s ability to adequately perform its proper functions, Landlord shall so notify Tenant in writing and supplementary system(s) may be required and installed by Landlord at Tenant’s expense, if within fifteen (15) days Tenant has not modified its use so as not to cause such overload. Operating criteria of the basic system are in accordance with the Massachusetts Energy Code and shall not be less than the following: (i) Cooling season indoor temperatures of not in excess of 73 - 79 -79 degrees Fahrenheit when outdoor temperatures are 91 degrees Fahrenheit ambient. (ii) Heating season minimum room temperature of 68 - 75 degrees Fahrenheit when outdoor temperatures are 6 degrees Fahrenheit ambient. B. Landlord shall provide heating, ventilating and air conditioning as normal seasonal changes may require during the hours of 8:00 a.m. to 6:00 p.m. p.m., Monday through Friday (legal holidays in all cases excepted). If Tenant shall require air conditioning (during the air conditioning season) or heating or ventilating during any other time period, Landlord shall use landlord’s best efforts to furnish such services for the area or areas specified by written request of Tenant delivered to the Building Superintendent or the Landlord before 3:00 p.m. of the business day preceding the extra usage. Landlord shall charge Tenant for such extra-hours usage at reasonable rates customary for first-class office buildings in the Boston Suburban market, and Tenant shall pay Landlord, as Additional Rentadditional rent, upon receipt of billing therefor.

HVAC. A. Heating, ventilating and air conditioning equipment will be provided with sufficient capacity to accommodate a maximum population density of one (1) person per one hundred fifty (150) square feet of useable floor area served, and a combined lighting and standard electrical load of 3.0 xxxxx per square foot of useable floor area. In the event Tenant introduces into the Premises personnel or equipment which overloads the system’s ability to adequately perform its proper functions, Landlord shall so notify Tenant in writing and supplementary system(s) may be required and installed by Landlord at Tenant’s expense, if within fifteen (15) days Tenant has not modified its use so as not to cause such overload. Operating criteria of the basic system shall not be less than the following: (i) Cooling season indoor temperatures of not in excess of 73 - 79 degrees Fahrenheit when outdoor temperatures are 91 degrees Fahrenheit ambient. (ii) Heating season minimum room temperature of 68 - 75 degrees Fahrenheit when outdoor temperatures are 6 degrees Fahrenheit ambient. B. Landlord shall provide heating, ventilating and air conditioning as normal seasonal changes may require during the hours of 8:00 a.m. to 6:00 p.m. p.m., Monday through Friday (legal holidays in all cases excepted) (the “HVAC Hours”). If Tenant shall require air conditioning (during the air conditioning season) or heating or ventilating during any other time period, Landlord shall use landlord’s best efforts to furnish such services for the area or areas specified by written request of Tenant delivered Texxxx xelivered to the Building Superintendent or the Landlord before 3:00 p.m. of the business day preceding the extra usage. Landlord shall charge Tenant for such extra-hours usage at reasonable rates customary for first-class office buildings in the Boston Suburban East Cambridge/Xxxxxxx Square market, and Tenant shall pay Landlord, as Additional Rent, upon receipt of billing therefor.

HVAC. A. Heating, ventilating and air conditioning equipment will be provided with sufficient capacity to accommodate a maximum population density of one (1) person per one hundred fifty (150) square feet of useable floor area served, and a combined lighting lightning and standard electrical load of 3.0 xxxxx per square foot of useable floor area. In the event Tenant introduces into the Premises personnel or equipment which overloads the system’s ability to adequately perform its proper functions, Landlord shall so notify Tenant in writing and supplementary system(s) may be required and arid installed by Landlord at Tenant’s expense, if within fifteen (15) days Tenant has not modified its use so as not to cause such overload. Operating criteria of the basic system shall not be less than the following: (i) Cooling season indoor temperatures temperature of not in excess of 73 - 79 degrees Fahrenheit when outdoor temperatures are temperature is 91 degrees Fahrenheit ambient. (ii) Heating season minimum room temperature of 68 - 75 degrees Fahrenheit when outdoor temperatures are temperature is 6 degrees Fahrenheit ambient. B. Landlord shall provide heating, ventilating and air conditioning as normal seasonal changes may require during the hours of Normal Building Operating Hours (8:00 a.m. to 6:00 p.m. P.m., Monday through Friday (Friday, legal holidays in all cases excepted). If Tenant shall require air conditioning (during the air conditioning season) or heating or ventilating during any other time periodseason outside Normal Building Operating Hours, Landlord shall use landlord’s best efforts to furnish such services for the area or areas specified by written request of Tenant delivered to the Building Superintendent or the Landlord before 3:00 p.m. of the business day preceding the extra usage. Landlord shall charge Tenant for For such extra-hours usage at reasonable rates customary for first-class office buildings in the Boston Suburban marketservices, and Tenant shall pay Landlord, as Additional Rentadditional rent, upon receipt of billing thereforbilling, a sum equal to the cost incurred by Landlord.

HVAC. A. Heating, ventilating and air conditioning equipment will be provided with sufficient capacity to accommodate a maximum population density of one (1) person per one hundred fifty (150) square feet of useable floor area served, and a combined lighting and standard electrical load of 3.0 xxxxx per square foot of useable floor area. In the event Tenant introduces into the Premises personnel or equipment which overloads the system’s ability to adequately perform its proper functions, Landlord shall so notify Tenant in writing and supplementary system(s) may be required and installed by Landlord at Tenant’s expense, if within fifteen (15) days Tenant has not modified its use so as not to cause such overload. Operating criteria of the basic system shall not be less than the following: (i) Cooling season indoor temperatures temperature of not in excess of 73 - 79 degrees Fahrenheit when outdoor temperatures are temperature is 91 degrees Fahrenheit ambient. (ii) Heating season minimum room temperature of 68 - 75 degrees Fahrenheit when outdoor temperatures are temperature is 6 degrees Fahrenheit ambient. B. Landlord shall provide heating, ventilating and air conditioning for the Premises, but expressly excluding the any portion of the Premises used for laboratory use, as normal seasonal changes may require during the hours of 8:00 6:00 a.m. to 6:00 7:00 p.m. Monday through Friday (legal holidays in all cases excepted). Tenant hereby acknowledges and agrees that Tenant shall be responsible for providing heating, ventilating and air conditioning for the portion of the Premises used for laboratory use. If Tenant shall require air conditioning (during the air conditioning season) or heating or ventilating during any other time period, Landlord shall use landlord’s best efforts to furnish such services for the area or areas specified by written request of Tenant delivered to the Building Superintendent or the Landlord before 3:00 p.m. of the business day preceding the extra usage. Landlord shall charge Tenant for such extra-hours usage at reasonable rates customary for first-class office buildings in the Boston Suburban market, and Tenant shall pay Landlord, as Additional Rent, upon receipt of billing therefor.

HVAC. A. Heating, ventilating and air conditioning equipment will be provided with sufficient capacity to accommodate a maximum population density of one (1) person per one hundred fifty (150) square feet of useable floor area served, and a combined lighting and standard electrical load of 3.0 6.0 xxxxx per square foot of useable floor area. In the event Tenant introduces into the Premises personnel or equipment which overloads the system’s ability to adequately perform its proper functions, Landlord shall so notify Tenant in writing and supplementary system(s) may be required and installed by Landlord at Tenant’s expense, if within fifteen (15) days Tenant has not modified its use so as not to cause such overload. Operating criteria of the basic system shall not be less than the following: (i) Cooling season indoor temperatures temperature of not in excess of 73 - 79 degrees Fahrenheit when outdoor temperatures are temperature is 91 degrees Fahrenheit ambient. (ii) Heating season minimum room temperature of 68 - 75 degrees Fahrenheit when outdoor temperatures are temperature is 6 degrees Fahrenheit ambient.Fahrenheit B. Landlord shall provide heating, ventilating and air conditioning as normal seasonal changes may require during the hours of Normal Building Operating Hours (8:00 a.m. to 6:00 p.m. p.m., Monday through Friday Friday, (legal and upon request 8:00 a.m. to 1:00 p.m. on Saturdays) the following holidays in all cases excepted). : New Year’s Day President’s Day Memorial Day Independence Day Labor Day Thanksgiving Day Christmas Day If Tenant shall require air conditioning (during the air conditioning season) or heating or ventilating during any other time periodseason outside Normal Building Operating Hours, Landlord shall use landlord’s best efforts to furnish such services for the area or areas specified by written request of Tenant delivered to the Building Superintendent or the Landlord before 3:00 p.m. of the business day preceding the extra usage. Landlord shall charge Tenant for For such extra-hours usage at reasonable rates customary for first-class office buildings in the Boston Suburban marketservices, and Tenant shall pay Landlord, as Additional Rent, upon receipt of billing thereforbilling, a sum equal to the cost incurred by Landlord.

HVAC. A. Heating, ventilating and air conditioning equipment will be provided with sufficient capacity to accommodate a maximum population density of one (1) person per one hundred fifty (150) square feet of useable rentable floor area served, and a combined lighting and standard electrical load of 3.0 4 xxxxx per square foot of useable rentable floor area. In the event Tenant introduces into the Premises personnel or equipment which overloads the system’s 's ability to adequately perform its proper functions, Landlord shall so notify Tenant in writing and supplementary system(s) may be required and installed by Landlord at Tenant’s expense, if writing. If within fifteen (15) days Tenant has not modified its use so as not to cause such overload, Landlord may, if needed, provide supplemental systems at Tenant's expense. Operating criteria of the basic system are in accordance with the Massachusetts Energy Code and shall not be less than the following: (i) Cooling season indoor temperatures conditions of not in excess of 73 - 79 degrees Fahrenheit 00X Xxxxxxxxxx when outdoor temperatures conditions are 91 degrees 00X Xxxxxxxxxx drybulb and 74E Fahrenheit ambientwetbulb. (ii) Heating season minimum room temperature of 68 - 75 degrees Fahrenheit 00X Xxxxxxxxxx when outdoor temperatures conditions are 6 degrees 1E Fahrenheit ambientdrybulb. B. Landlord shall provide heating, ventilating and air conditioning as normal seasonal changes charges may require during the hours of Normal Building Operating Hours (8:00 a.m. to 6:00 p.m. p.m., Monday through Friday (Friday, and 8:00 a.m. to 1:00 p.m. on Saturdays, legal holidays in all cases excepted). If Tenant shall require air conditioning (during the air conditioning season) or heating or ventilating (during any other time periodseason) outside Normal Building Operating Hours, Landlord shall use landlord’s 's best efforts to furnish such services for the area or areas specified by written request of Tenant delivered to the Building Superintendent or the Landlord before 3:00 p.m. of the business day preceding the extra usage. Landlord shall charge Tenant for For such extra-hours usage at reasonable rates customary for first-class office buildings in the Boston Suburban marketservices, and Tenant shall pay Landlord, as Additional Rentadditional rent, upon receipt of billing thereforbilling, a sum equal to the cost actually incurred by Landlord as reasonably calculated by Landlord's engineers, pro-rated if more than one tenant is requesting service.

HVAC. A. Heating, ventilating and air conditioning equipment will be provided with sufficient capacity to accommodate a maximum population density of one (1) person per one hundred fifty (150) square feet of useable rentable floor area served, and a combined lighting and standard electrical load of 3.0 xxxxx 4 watts per square foot of useable rentable floor area. In the event Tenant evenx Xxxant introduces into the Premises personnel or equipment which overloads the system’s 's ability to adequately perform its proper functions, Landlord shall so notify Tenant in writing and supplementary system(s) may be required and installed by Landlord at Tenant’s expense, if writing. If within fifteen (15) days Tenant has not modified its use so as not to cause such overload, Landlord may, if needed, provide supplemental systems at Tenant's expense. Operating criteria of the basic system are in accordance with the Massachusetts Energy Code and shall not be less than the following: (i) Cooling season indoor temperatures conditions of not in excess of 73 - 79 degrees 78E Fahrenheit when outdoor temperatures conditions are 91 degrees 88E Fahrxxxxxx xxxxxxx and 74E Fahrenheit ambientwetbulb. (iixi) Heating season minimum room temperature of 68 - 75 degrees 72E Fahrenheit when outdoor temperatures conditions are 6 degrees Fahrenheit ambient1E Fahrexxxxx xxxxxxx. B. Landlord shall provide heating, ventilating and air conditioning as normal seasonal changes charges may require during the hours of Normal Building Operating Hours (7:00 a.m. to 6:00 p.m., Monday through Friday, and 8:00 a.m. to 6:00 1:00 p.m. Monday through Friday (on Saturdays, legal holidays in all cases excepted). If Tenant shall require air conditioning (during the air conditioning season) or heating or ventilating during any other time periodseason outside Normal Building Operating Hours, Landlord shall use landlord’s 's best efforts to furnish such services for the area or areas specified by written request of Tenant delivered to the Building Superintendent or the Landlord before 3:00 p.m. of the business day preceding the extra usage. Landlord shall charge Tenant for For such extra-hours usage at reasonable rates customary for first-class office buildings in the Boston Suburban marketservices, and Tenant shall pay Landlord, as Additional Rentadditional rent, upon receipt of billing thereforbilling, a sum equal to the cost incurred by Landlord.

HVAC. A. Heating, ventilating and air conditioning equipment will be provided with sufficient capacity to accommodate a maximum population density of one (1) person per one hundred fifty (150) square feet of useable floor area served, and a combined lighting and standard electrical load of 3.0 xxxxx wxxxx per square foot of useable floor area. In the event Tenant introduces into the Premises personnel or equipment which overloads the system’s ability to adequately perform its proper functions, Landlord shall so notify Tenant in writing and supplementary system(s) may be required and installed by Landlord at Tenant’s expense, if within fifteen (15) days Tenant has not modified its use so as not to cause such overload. Operating criteria of the basic system shall comply with ASHRAE standard 62-1999 and shall not be less than the following: (i) Cooling season indoor temperatures conditions of not in excess of 73 - 79 78 degrees Fahrenheit when outdoor temperatures conditions are 91 degrees Fahrenheit ambientdry-bulb and 73 degrees Fahrenheit wet-bulb. (ii) Heating season minimum room temperature of 68 - 75 70 degrees Fahrenheit when outdoor temperatures conditions are 6 degrees Fahrenheit ambientdrybulb. B. Landlord shall provide heating, ventilating and air conditioning as normal seasonal changes may require during the hours of 8:00 a.m. to 6:00 p.m. p.m., Monday through Friday Friday, and 8:00 a.m. to 12:00 p.m. on Saturdays (legal holidays in all cases excepted). If Tenant shall require air conditioning (during the air conditioning season) or heating or ventilating during any other time period, Landlord shall use landlord’s best efforts to furnish such services for the area or areas specified by written request of Tenant delivered to the Building Superintendent or the Landlord before 3:00 p.m. of the business day preceding the extra usage. Landlord shall charge Tenant for such extra-hours usage at reasonable rates customary for first-class office buildings in the Boston Suburban market, and Tenant shall pay Landlord, as Additional Rentadditional rent, upon receipt of billing therefor.

HVAC. A. Heating, ventilating and air conditioning equipment will be provided with sufficient capacity to accommodate a maximum population density of one (1) person per one hundred fifty (150) square feet of useable floor area served, and a combined lighting and standard electrical load of 3.0 xxxxx per square foot of useable floor area. In the event Tenant introduces into the Premises personnel or equipment which overloads the system’s ability to adequately perform its proper functions, Landlord shall so notify Tenant in writing and supplementary system(s) may be required and installed by Landlord at Tenant’s expense, if within fifteen (15) days Tenant has not modified its use so as not to cause such overload. Operating criteria of the basic system are in accordance with the Massachusetts Energy Code and shall not be less than the following: (i) Cooling season indoor temperatures of not in excess of 73 - 79 degrees Fahrenheit when outdoor temperatures are 91 degrees Fahrenheit ambient. (ii) Heating season minimum room temperature of 68 - 75 degrees Fahrenheit when outdoor temperatures are 6 degrees Fahrenheit ambient. B. Landlord shall provide heating, ventilating and air conditioning as normal seasonal changes may require during the hours of 8:00 a.m. to 6:00 p.m. p.m., Monday through Friday (legal holidays in all cases excepted). If Tenant shall require air conditioning (during the air conditioning season) or heating or ventilating during any other time period, Landlord shall use landlord’s best efforts to furnish such services for the area or areas specified by written request of Tenant delivered Texxxx xelivered to the Building Superintendent or the Landlord before 3:00 p.m. of the business day preceding the extra usage. Landlord shall charge Tenant for such extra-hours usage at reasonable rates customary for first-class office buildings in the Boston Suburban market, and Tenant shall pay Landlord, as Additional Rentadditional rent, upon receipt of billing therefor.

HVAC. A. Heating, ventilating and air conditioning equipment will be provided with sufficient capacity to accommodate a maximum population density of one (1) person per one hundred fifty (150) square feet of useable floor area served, and a combined lighting and standard electrical load of 3.0 xxxxx per square foot of useable floor area. In the event Tenant introduces into the Premises personnel or equipment which overloads the system’s ability to adequately perform its proper functions, Landlord shall so notify Tenant in writing and supplementary system(s) may be required and installed by Landlord at Tenant’s expense, if within fifteen (15) days Tenant has not modified its use so as not to cause such overload. Operating criteria of the basic system shall not be less than the following: (i) Cooling season indoor temperatures of not in excess of 73 - 79 degrees Fahrenheit when outdoor temperatures are 91 degrees Fahrenheit ambient. (ii) Heating season minimum room temperature of 68 - 75 degrees Fahrenheit when outdoor temperatures are 6 degrees Fahrenheit ambient. B. Landlord shall provide heating, ventilating and air conditioning as normal seasonal changes may require during the hours of 8:00 a.m. to 6:00 p.m. p.m., Monday through Friday (legal holidays in all cases excepted) (the “HVAC Hours”). If Tenant shall require air conditioning (during the air conditioning season) or heating or ventilating during any other time period, Landlord shall use landlord’s best efforts to furnish such services for the area or areas specified by written request of Tenant Xxxxxx delivered to the Building Superintendent or the Landlord before 3:00 p.m. of the business day preceding the extra usage. Landlord shall charge Tenant for such extra-hours usage at reasonable rates customary for first-class office buildings in the Boston Suburban East Cambridge/Xxxxxxx Square market, and Tenant shall pay Landlord, as Additional Rent, upon receipt of billing therefor.

HVAC. A. Heating, ventilating and air conditioning equipment will be provided with sufficient capacity to accommodate a maximum population density of one (1) person per one hundred fifty (150) square feet of useable floor area served, and a combined lighting and standard electrical load of 3.0 xxxxx per square foot of useable floor area. In the event Tenant introduces into the Premises personnel or equipment which overloads the system’s 's ability to adequately perform its proper functions, Landlord shall so notify Tenant in writing and supplementary system(s) may be required and installed by Landlord at Tenant’s 's expense, if within fifteen (15) days Tenant has not modified its use so as not to cause such overload. Operating criteria of the basic system are in accordance with the Massachusetts Energy Code and shall not be less than the following: (i) Cooling season indoor temperatures conditions of not in excess of 73 - 79 78 degrees Fahrenheit when outdoor temperatures conditions are 91 degrees Fahrenheit ambient.drybulb and 73 degrees Fahrenheit wetbulb. Exhibit 10.9 (ii) Heating season minimum room temperature of 68 - 75 72 degrees Fahrenheit when outdoor temperatures conditions are 6 degrees Fahrenheit ambientdrybulb. B. Landlord shall provide heating, ventilating and air conditioning as normal seasonal changes charges may require during the hours of Normal Building Operating Hours (8:00 a.m. to 6:00 p.m. p.m., Monday through Friday (Friday, and 8:00 a.m. to 1:00 p.m. on Saturdays, legal holidays in all cases excepted). If Tenant shall require air conditioning (during the air conditioning season) or heating or ventilating during any other time periodseason outside Normal Building Operating Hours, Landlord shall use landlord’s 's best efforts to furnish such services for the area or areas specified by written request of Tenant delivered to the Building Superintendent or the Landlord before 3:00 p.m. of the business day preceding the extra usage. Landlord shall charge Tenant for For such extra-hours usage at reasonable rates customary for first-class office buildings in the Boston Suburban marketservices, and Tenant shall pay Landlord, as Additional Rentadditional rent, upon receipt of billing thereforbilling, a sum equal to the cost incurred by Landlord.

HVAC. A. Heating, ventilating and air conditioning equipment will be provided with sufficient capacity to accommodate a maximum population density of one (( 1) person per one hundred fifty (150) square feet of useable floor area served, and a combined lighting and standard electrical load of 3.0 6.0 xxxxx per square foot of useable floor area. In the event Tenant introduces into the Premises personnel or equipment which overloads the system’s ability to adequately perform its proper functions, Landlord shall so notify Tenant in writing and supplementary system(s) may be required and installed by Landlord at Tenant’s expense, if within fifteen (15) days Tenant has not modified its use so as not to cause such overload. Operating criteria of the basic system shall not be less than the following: (i) Cooling season indoor temperatures temperature of not in excess of 73 - 79 degrees Fahrenheit when outdoor temperatures are temperature is 91 degrees Fahrenheit ambient. (ii) Heating season minimum room temperature of 68 - 75 degrees Fahrenheit when outdoor temperatures are temperature is 6 degrees Fahrenheit ambient. B. Landlord shall provide heating, ventilating and air conditioning as normal seasonal changes may require during the hours of 8:00 a.m. Normal Building Operating Hours (8:00a.m. to 6:00 p.m. 6:00p.m., Monday through Friday (Friday, legal holidays in all cases excepted). If Tenant shall require air conditioning (during the air conditioning season) or heating or ventilating during any other time periodseason outside Normal Building Operating Hours, Landlord shall use landlord’s best efforts to furnish such services for the area or areas specified by written request of Tenant delivered to the Building Superintendent or the Landlord before 3:00 p.m. 3:00p.m. of the business day preceding the extra usage. Landlord shall charge Tenant for For such extra-hours usage at reasonable rates customary for first-class office buildings in the Boston Suburban marketservices, and Tenant shall pay Landlord, as Additional Rent, upon receipt of billing thereforbilling, a sum equal to the cost incurred by Landlord.

HVAC. A. Heating, ventilating and air conditioning equipment will be provided with sufficient capacity to accommodate a maximum population density of one (1) person per one hundred fifty (150) square feet of useable floor area served, and a combined lighting and standard electrical load of 3.0 xxxxx per square foot of useable floor area. In the event Tenant introduces into the Premises personnel or equipment which overloads the system’s ability to adequately perform its proper functions, Landlord shall so notify Tenant in writing and supplementary system(s) may be required and installed by Landlord at Tenant’s expense, if within fifteen (15) days Tenant has not modified its use so as not to cause such overload. Operating criteria of the basic system shall not be less than the following: (i) Cooling season indoor temperatures of not in excess of 73 - 79 degrees Fahrenheit when outdoor temperatures are 91 degrees Fahrenheit ambient. (ii) Heating season minimum room temperature of 68 - 75 degrees Fahrenheit when outdoor temperatures are 6 degrees Fahrenheit ambient. B. Landlord shall provide heating, ventilating and air conditioning as normal seasonal changes may require during the hours of 8:00 a.m. to 6:00 p.m. Monday through Friday (legal holidays in all cases excepted)) and during the hours of 9:00 a.m. to 1:00 p.m. on Saturdays. If Tenant shall require air conditioning (during the air conditioning season) or heating or ventilating during any other time period, Landlord shall use landlord’s best efforts to furnish such services for the area or areas specified by written request of Tenant delivered to the Building Superintendent or the Landlord before 3:00 p.m. of the business day preceding the extra usage. Landlord shall charge Tenant for such extra-hours usage at reasonable rates customary for first-class office buildings in the Boston Suburban market, and Tenant shall pay Landlord, as Additional Rent, upon receipt of billing therefor.

HVAC. A. Heating, ventilating and air conditioning equipment will be provided with sufficient capacity to accommodate a maximum population density of one (1) person per one hundred fifty (150100) square feet of useable rentable floor area served, and a combined lighting and standard electrical load of 3.0 xxxxx per 4 wattx xxx square foot of useable rentable floor area. In the event Tenant introduces into the Premises personnel or equipment which overloads the system’s 's ability to adequately perform its proper functions, Landlord shall so notify Tenant in writing and supplementary system(s) may be required and installed by Landlord at Tenant’s expense, if writing. If within fifteen (15) days days, Tenant has not modified its use so as not to cause such overload, Landlord may, if as needed, at Tenant's option, provide supplementary systems at Tenant's expense. EXHIBIT D 88 Operating criteria of the basic system are in accordance with the Massachusetts Energy Code and shall not be less than the following: (i) Cooling season indoor temperatures conditions of not in excess of 73 - 79 78 degrees Fahrenheit and 50 percent relative humidity when outdoor temperatures conditions are 91 88 degrees Fahrenheit ambientdrybulb and 74 degrees Fahrenheit wetbulb. (ii) Heating season minimum room temperature of 68 - 75 72 degrees Fahrenheit when outdoor temperatures conditions are 6 3 degrees Fahrenheit ambientdrybulb. B. Landlord shall provide heating, ventilating and air conditioning as normal seasonal changes charges may require during the hours of Normal Building Operating Hours (7:00 a.m. to 6:00 p.m., Monday through Friday, and 8:00 a.m. to 6:00 1:00 p.m. Monday through Friday (on Saturdays, legal holidays in all cases excepted). If Tenant shall require air conditioning (during the air conditioning season) or heating or ventilating during any other time periodseason outside Normal Building Operating Hours, Landlord shall use landlord’s 's best efforts to furnish such services for the area or areas specified by written request of Tenant delivered to the Building Superintendent or the Landlord before 3:00 p.m. of the business day preceding the extra usage. Landlord shall charge Tenant for For such extra-hours usage at reasonable rates customary for first-class office buildings in the Boston Suburban marketservices, and Tenant shall pay Landlord, as Additional Rent, upon receipt of billing thereforbilling, a sum equal to the cost incurred by Landlord.

HVAC. A. Heating, ventilating and air conditioning equipment will be provided with sufficient capacity to accommodate a maximum population density of one (1( l ) person per one hundred fifty (150) square feet of useable floor area served, and a combined lighting and standard electrical load of 3.0 xxxxx per square foot of useable floor area. In the event Tenant introduces into the Premises personnel or equipment which overloads the system’s 's ability to adequately perform its proper functions, Landlord shall so notify Tenant in writing and supplementary system(s) may be required and installed by Landlord at Tenant’s 's expense, if within fifteen (15) days Tenant has not modified its use so as not to cause such overload. Operating criteria of the basic system shall not be less than the following: (i) Cooling season indoor temperatures of not in excess of 73 - 79 degrees Fahrenheit when outdoor temperatures are 91 degrees Fahrenheit ambient. (ii) Heating season minimum room temperature of 68 - 75 degrees Fahrenheit when outdoor temperatures are 6 degrees Fahrenheit ambient. B. Landlord shall provide heating, ventilating and air conditioning as normal seasonal changes may require req uire during the hours (the "Building Hours") of 8:00 a.m. to 6:00 p.m. p.m . Monday through Friday and 9:00 a.m. to 1:00 p.m:­ on Saturdays (legal holidays in all cases excepted). Landlord and Tenant will cooperate with each other in good faith to operate the heating, ventilating and air conditioning systems on Saturdays only in those portions of the Premises that are actually occupied on such days. If Tenant shall require air conditioning (during the air conditioning season) or heating or ventilating during any other time period, Landlord shall use landlord’s Landlord's best efforts to furnish such services for the area or areas specified by written request of Tenant delivered to the Building Superintendent or the Landlord before 3:00 p.m. within a reasonable amount of the business day time preceding the extra usage. Tenant may request such after hours service on a zone-by-zone basis. Landlord shall charge Tenant for an amount equal to the sum of (x) the actual costs charged to Landlord by the utility company to provide such extra-hours usage at service and (y) a reasonable rates customary additional charge for first-class office buildings in the Boston Suburban marketdepreciation of equipment, manpower and administrative fees, and Tenant shall pay the same to Landlord, as Additional Rentadditional rent, upon receipt of billing therefor.

HVAC. A. Heating, ventilating and air conditioning equipment will be provided with sufficient capacity to accommodate a maximum population density of one (1) person per one hundred fifty (150) square feet of useable floor area served, and a combined lighting and standard electrical load of 3.0 1.5 xxxxx per square foot of useable floor areaarea for lights and 5.5 xxxxx per square foot of useable floor area for power. In the event Tenant introduces into the Premises personnel or equipment which overloads the system’s ability to adequately perform its proper functions, Landlord shall so notify Tenant in writing and supplementary system(s) may be required and installed by Landlord at Tenant’s expense, if within fifteen (15) days Tenant has not modified its use so as not to cause such overload. Operating criteria of the basic system are in accordance with the Massachusetts Energy Code and shall not be less than the following: (i) Cooling season indoor temperatures of not in excess of 73 - 73-79 degrees Fahrenheit when outdoor temperatures are temperature is 91 degrees Fahrenheit ambient. (ii) Heating season minimum room temperature of 68 - 68-75 degrees Fahrenheit when outdoor temperatures are temperature is 6 degrees Fahrenheit ambient. B. Landlord shall provide heating, ventilating and air conditioning as normal seasonal changes charges may require during the hours of Normal Building Operating Hours (8:00 a.m. to 6:00 p.m. p.m., Monday through Friday (Friday, and legal holidays in all cases excepted). If Tenant shall require air conditioning (during the air conditioning season) or heating or ventilating during any other time periodseason outside Normal Building Operating Hours, Landlord shall use landlord’s best efforts to furnish such services for the area or areas specified by written request of Tenant delivered to the Building Superintendent or the Landlord before 3:00 p.m. of the business day preceding the extra usage. Landlord shall charge Tenant for For such extra-hours usage at reasonable rates customary for first-class office buildings in the Boston Suburban marketservices, and Tenant shall pay Landlord, as Additional Rent, upon receipt of billing thereforbilling, a sum equal to the cost incurred by Landlord.

HVAC. A. Heating, ventilating and air conditioning equipment will be provided with sufficient capacity to accommodate a maximum population density of one (1) person per one hundred fifty (150) square feet of useable floor area served, and a combined lighting and standard electrical load of 3.0 xxxxx per square foot of useable floor area. In the event Tenant introduces into the Premises personnel or equipment which overloads the system’s 's ability to adequately perform its proper functions, Landlord shall so notify Tenant in writing and supplementary system(s) may be required and installed by Landlord at Tenant’s 's expense, if within fifteen (15) days Tenant has not modified its use so as not to cause such overload. Operating criteria of the basic system are in accordance with the Massachusetts Energy Code and shall not be less than the following: (i) Cooling season indoor temperatures conditions of not in excess of 73 - 79 78 degrees Fahrenheit when outdoor temperatures conditions are 91 degrees Fahrenheit ambientdrybulb and 73 degrees Fahrenheit wetbulb. (ii) Heating season minimum room temperature of 68 - 75 70 degrees Fahrenheit when outdoor temperatures conditions are 6 degrees Fahrenheit ambientdrybulb. B. Landlord shall provide heating, ventilating and air conditioning as normal seasonal changes charges may require during the hours of Normal Building Operating Hours (8:00 a.m. to 6:00 p.m. p.m., Monday through Friday (Friday, and 8:00 a.m. to 1:00 p.m. on Saturdays, legal holidays in all cases excepted). If Tenant shall require air conditioning (during the air conditioning season) or heating or ventilating during any other time periodseason outside Normal Building Operating Hours, Landlord shall use landlord’s 's best efforts to furnish such services for the area or areas specified by written request of Tenant delivered to the Building Superintendent or the Landlord before 3:00 p.m. of the business day preceding the extra usage. Landlord shall charge Tenant for For such extra-hours usage at reasonable rates customary for first-class office buildings in the Boston Suburban marketservices, and Tenant shall pay Landlord, as Additional Rentadditional rent, upon receipt of billing thereforbilling, a sum equal to the cost incurred by Landlord.

HVAC. A. Heating, ventilating and air conditioning equipment will be provided with sufficient capacity to accommodate a maximum population density of one one (1) person per one hundred fifty (150) square feet of useable floor area served, and a combined lighting and standard electrical load of 3.0 xxxxx per square foot of useable floor area. In the event Tenant introduces into the Premises personnel or equipment which overloads the system’s 's ability to adequately perform its proper functions, Landlord shall so notify Tenant in writing and supplementary system(s) may be required and installed by Landlord at Tenant’s 's expense, if within fifteen (15) days Tenant has not modified its use so as not to cause such overload. Operating criteria of the basic system shall not be less than the following: (i) Cooling season indoor temperatures of not in excess of 73 - 79 degrees Fahrenheit when outdoor temperatures are 91 degrees Fahrenheit ambient. (ii) Heating season minimum room temperature of 68 - 75 degrees Fahrenheit when outdoor temperatures are 6 degrees Fahrenheit ambient. B. Landlord shall provide heating, ventilating and ai:id air conditioning as normal seasonal changes may require during the hours honrs of 8:00 a.m. to 6:00 p.m. Monday through Friday (legal holidays in all cases excepted). If Tenant shall require air conditioning (during dnring the air conditioning season) or heating or ventilating during any dnring any. other time period, Landlord shall use landlord’s 's best efforts to furnish such snch services for the area or areas specified by written request of Tenant delivered to the Building Superintendent or the Landlord before 3:00 p.m. of the business day preceding the extra usage. Landlord shall charge Tenant for such extra-hours extra­ honrs usage at reasonable rates customary for first-class office buildings in the Boston Suburban marketClass A Central 128 Area Market, except that there shall be no charge for such extra-honrs usage on Satiirdays between the honrs of 9:00 a.m. and 1:00 p.m. (legal holidays excepted), and Tenant shall pay Landlord, as Additional Rentadditional rent, upon receipt of billing therefor.. GSDOCS\1689479.11 5/25f2007 Exhibit C

HVAC. A. Heating, ventilating and air conditioning equipment will be provided with sufficient capacity to accommodate a maximum population density of one (1) person per one hundred fifty (150) square feet of useable floor area served, and a combined lighting and standard electrical load of 3.0 6.0 xxxxx per square foot of useable floor area. In the event Tenant introduces into the Premises personnel or equipment which overloads the system’s ability to adequately perform its proper functions, Landlord shall so notify Tenant in writing and supplementary system(s) may be required and installed by Landlord at Tenant’s expense, if within fifteen (15) days Tenant has not modified its use so as not to cause such overload. Operating criteria of the basic system shall not be less than the following: (i) Cooling season indoor temperatures temperature of not in excess of 73 - 79 degrees Fahrenheit when outdoor temperatures are temperature is 91 degrees Fahrenheit ambient. (ii) Heating season minimum room temperature of 68 - 75 degrees Fahrenheit when outdoor temperatures are temperature is 6 degrees Fahrenheit ambient. B. Landlord shall provide heating, ventilating and air conditioning as normal seasonal changes may require during the hours of Normal Building Operating Hours (8:00 a.m. to 6:00 p.m. p.m., Monday through Friday (Friday, legal holidays in all cases excepted). If Tenant shall require air conditioning (during the air conditioning season) or heating or ventilating during any other time periodseason outside Normal Building Operating Hours, Landlord shall use landlord’s best efforts to furnish such services for the area or areas specified by written request of Tenant delivered to the Building Superintendent or the Landlord before 3:00 p.m. of the business day preceding the extra usage. Landlord shall charge Tenant for For such extra-hours usage at reasonable rates customary for first-class office buildings in the Boston Suburban marketservices, and Tenant shall pay Landlord, as Additional Rent, upon receipt of billing thereforbilling, a sum equal to the cost incurred by Landlord.

HVAC. A. Heating, ventilating and air conditioning equipment will be provided with sufficient capacity to accommodate a maximum population density of one (1) person per one hundred fifty (150) square feet of useable floor area served, and a combined lighting and standard electrical load of 3.0 xxxxx per square foot of useable floor area. In the event Tenant introduces into the Premises personnel or equipment which overloads the system’s ability to adequately perform its proper functions, Landlord shall so notify Tenant in writing and supplementary system(s) may be required and installed by Landlord at Tenant’s expense, if within fifteen (15) days Tenant has not modified its use so as not to cause such overload. Operating criteria of the basic system shall not be less than the following: (i) Cooling season indoor temperatures of not in excess of 73 - 79 degrees Fahrenheit when outdoor temperatures are 91 degrees Fahrenheit ambient. (ii) Heating season minimum room temperature of 68 - 75 degrees Fahrenheit when outdoor temperatures are 6 degrees Fahrenheit ambient. B. Landlord shall provide heating, ventilating and air conditioning as normal seasonal changes may require during the hours (the “Building Hours”) of 8:00 a.m. to 6:00 p.m. Monday through Friday and 9:00 a.m. to 1:00 p.m. on Saturdays (legal holidays in all cases excepted). Landlord and Tenant will cooperate with each other in good faith to operate the heating, ventilating and air conditioning systems on Saturdays only in those portions of the Premises that are actually occupied on such days. If Tenant shall require air conditioning (during the air conditioning season) or heating or ventilating during any other time period, Landlord shall use landlordLandlord’s best efforts to furnish such services for the area or areas specified by written request of Tenant delivered to the Building Superintendent or the Landlord before 3:00 p.m. within a reasonable amount of the business day time preceding the extra usage. Tenant may request such after hours service on a zone-by-zone basis. Landlord shall charge Tenant for an amount equal to the sum of (x) the actual costs charged to Landlord by the utility company to provide such extra-hours usage at service and (y) a reasonable rates customary additional charge for first-class office buildings in the Boston Suburban marketdepreciation of equipment, manpower and administrative fees, and Tenant shall pay the same to Landlord, as Additional Rentadditional rent, upon receipt of billing therefor.

HVAC. A. Heating, ventilating and air conditioning equipment will be provided with sufficient capacity to accommodate a maximum population density of one (1) person per one hundred fifty (150) square feet of useable floor area served, and a combined lighting and standard electrical load of 3.0 xxxxx per square foot of useable floor area. In the event Tenant introduces into the Premises personnel or equipment which overloads the system’s 's ability to adequately perform its proper functions, Landlord shall so notify Tenant in writing and supplementary system(s) may be required and installed by Landlord at Tenant’s 's expense, if within fifteen (15) days Tenant has not modified its use so as not to cause such overload. Operating criteria of the basic system shall not be less than the following: (i) i. Cooling season indoor temperatures temperature of not in excess of 73 - 79 degrees Fahrenheit when outdoor temperatures are temperature is 91 degrees Fahrenheit ambient. (ii) . Heating season minimum room temperature of 68 - 75 degrees Fahrenheit when outdoor temperatures are temperature is 6 degrees Fahrenheit ambient. B. Landlord shall provide heating, ventilating and air conditioning as normal seasonal changes charges may require during the hours of 8:00 a.m. 7am to 6:00 p.m. 9pm Monday through Friday (legal holidays in all cases excepted)) at Tenant's expense. Exhibit D If Tenant shall require air conditioning (during the air conditioning season) or heating or ventilating during any other time period, Landlord shall use landlord’s 's best efforts to furnish such services for the area or areas specified by written request of Tenant delivered to the Building Superintendent or the Landlord before 3:00 p.m. of the business day preceding the extra usage. Landlord shall charge Tenant for such extra-hours usage at reasonable rates customary for first-class office buildings in the Boston Suburban market, and Tenant shall pay Landlord, as Additional Rent, upon receipt of billing therefor.

HVAC. A. Heating, ventilating and air conditioning equipment will be provided with sufficient capacity to accommodate a maximum population density of one (1) person per one hundred fifty (150) square feet of useable floor area served, and a combined lighting and standard electrical load of 3.0 xxxxx per square foot of useable floor area. In the event Tenant introduces into the Premises personnel or equipment which overloads the system’s ability to adequately perform its proper functions, Landlord shall so notify Tenant in writing and supplementary system(s) may be required and installed by Landlord at Tenant’s expense, if within fifteen (15) days Tenant has not modified its use so as not to cause such overload. Operating criteria of the basic system shall not be less than the following: (i) Cooling season indoor temperatures of not in excess of 73 - 79 73—79 degrees Fahrenheit when outdoor temperatures are 91 degrees Fahrenheit ambient. (ii) Heating season minimum room temperature of 68 - 75 68—75 degrees Fahrenheit when outdoor temperatures are 6 degrees Fahrenheit ambient. B. Landlord shall provide heating, ventilating and air conditioning as normal seasonal changes may require during the hours of 8:00 a.m. to 6:00 p.m. p.m., Monday through Friday (legal holidays in all cases excepted)) and, provided Tenant has made prior written request pertaining to each applicable Saturday, 8:00 a.m. to 1:00 p.m. each such Saturday. If Tenant shall require air conditioning (during the air conditioning season) or heating or ventilating during any other time period, Landlord shall use landlord’s best efforts to furnish such services for the area or areas specified by written request of Tenant delivered to the Building Superintendent or the Landlord before 3:00 p.m. of the business day preceding the extra usage. Landlord shall charge Tenant for such extra-hours usage at reasonable rates customary for first-class office buildings in the Boston Suburban East Cambridge/Xxxxxxx Square market, and Tenant shall pay Landlord, as Additional Rent, upon receipt of billing therefor.