NO EXCESSIVE WATER USENo washing cars, playing with water, filling swimming pools or other excessive misuse of water please. $150 worth of water usage per apartment per water billing period (three months) is included in the rent.

First you need to continue to increase you investing capital. 10-15k is a great start, but it goes quickly.

How should I handle this situation, while wanting to continue working with this potential future buyer?

The upward pressure on Cap Rates are going to continue due to the Steel Tariffs imposed by the current administration which is due to expire May. 2018.

Know what role you will play in the process and what roles you will hire out.

Like I always say, you guys motivate me to continue to develop and grow. 

Just a deal I found and continued to pursue it.I've been looking at the possibility of presenting a counter offer with a Master Lease Agreement. 

Or just continue paying for our rented apartment while we put that 90K into real estate that can generate income (then later potentially buy a home)?

They know how the game is played. 

I'll continue to asset manage til resale, or manage the default if borrower stops paying.