Shorenstein has said its 3.8-acre Mission Bay development willconsist of two five-story buildings each totaling plus-or-minus225,000 sf. If the LOI with FibroGen is consummated, FibroGen wouldget a 240,000 sf building to itself plus expansion rights for whatwould end up being the 210,000-sf second building, according to onesource. FibroGen is currently housed in about 100,000 sf at 225Gateway Blvd. in South San Francisco. Both FibroGen and Shorensteinhave declined comment.

According to multiple sources, Shorenstein executive vicepresident Tom Hart revealed at a local real estate discussion lastweek that the company was in advanced discussions with a tenant forthe new development and was confident enough about breaking groundthis fall that it had started purchasing construction materialsincluding steel. FibroGen representatives were seen "hanging out"at the booth, according to one those sources.

The Mission Bay submarket is a 303-acre, mixed-use developmentthat at build-out will include 6,000 units of housing; five millionsf of office, R&D and lab space; 800,000 sf of retail space; a500-room hotel; 50 acres of open space; a 500-student public schooland a police and fire station.