EXHIBIT 10.57 PURCHASE AND SALE AGREEMENT, CONTRIBUTION AGREEMENT AND JOINT ESCROW INSTRUCTIONS This PURCHASE AND SALE AGREEMENT, CONTRIBUTION AGREEMENT AND JOINT ESCROW INSTRUCTIONS (the "Agreement") is made on May 12, 1997 (the "Effective Date"), by...Purchase and Sale Agreement, Contribution Agreement and Joint Escrow Instructions • July 3rd, 1997 • Kilroy Realty Corp • Real estate investment trusts • California
