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HOUSTON — San Francisco-based Shorenstein Properties has completed the purchase of the 1.2 million-square-foot 800 Bell Street, an office tower located in downtown Houston. The 45-story office tower covers two city blocks and includes a seven-story parking garage. ExxonMobil Corp., the seller, also occupies the building. Shorenstein Properties purchased the property for Shorenstein Realty Investors Ten, a fund formed in 2010 with $1.23 billion in committed capital. Simultaneous with the purchase, ExxonMobil has leased back the entire building into 2015. Shorenstein plans to make upgrades upon ExxonMobil's departure.