Specializing in helping start-ups, Rofo's a free service for finding affordable digs for work/retail/industrial/living. Filter results by price/sq footage/area/desired lease type, and applicable listings (pulled from brokers and users) will be displayed beside a Gmap plotting their locations; if you see something juicy, an extra click'll get you full details and photos -- good idea for start-up's still on you.

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Have a looksee at Rofo.com