I think you need to think larger than real estate is only finding a place to live.

Who are the actors of this market? Tenants, property manager, property owner, super intendant, etc. What do they need to do? Pay their rent, ask for maintenance, send paperwork, track their tenants, track their expenses, etc.

Their is plenty of stuff that could be done. Now I'm pretty sure some or all of these are already addressed by some company.