I am not up on the sq ft pricing, but what i would do is break it down to the time spent in each apartment, the service, smoke detectors, doorbells and common lighting. Then add it up tack on you % of profit and hope it works out. The bad part about the homeowners slow pace is that it will often have you going there to find out nothing is done or only parts of it are ready for you. Make him aware of that and set a scedule of some sort.