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SAN FRANCISCO — Boston Properties has purchased a development site at 535 Mission Street in San Francisco for $71 million. It plans to erect a $215-million, Class A office tower on the site. Construction is scheduled to commence in mid-February, with completion set for fall 2014. The 27-story tower will strive for a LEED-Gold rating. It will also contain some retail space. Boston Properties has also agreed to purchase the last remaining land parcel inside the city’s Reston Town Center for $27 million. The parcel is zoned for 250,000 square feet of office space. Boston Properties is looking into potential mixed-use opportunities on this site. This sale is expected to close in the first quarter of 2013.