A few quick ideas:
- Can you rent the furniture equipment (lease it on a monthly basis), for startups that don't want to pay the high up front cost?
- Can you offer a peer to peer listing service for other startups to sell their unwanted space or furniture to each other and you manage it?
- Can you add an option for individuals to book day rates to work from an office instead of coffee shops?
- Can you innovate on the actual financial model of the "selling of space", i.e. make a no down payment, have weekly payments instead of monthly for cash strapped companies?
- Can you rent our space in unorthodox places like bars, night clubs, and night restaurants that can pop up for day time work space from 8am-5pm?

Just a few quick ideas, would be helpful to know what your business is!