Hines senior managing director Cameron Falconer isn't concerned about the amount of office space being added to the market (that's good, considering his gigantic 80-story Transbay Tower delivers in a few years). He is worried about the lack of options for tenants down the road. As the economy improves, he thinks S.F. will literally run out of space. Tech, law firms, and financial services firms are headed toward the same type of programming, with across-the-board requests for high ceilings, access to light, and great air quality. Transbay employees won't need to switch elevators to shoot up to higher-up floors. That'll be an interesting ride, he says.