Many foundation problems have water as a root cause - be that infiltration in a crawl space, drainage around the site, cracked sewer line or water line.

Is there a rough way of determining the number of apartment units that can fit in a building while accounting for space loss due to walls, hallways and staircases?

Pivot to a less saturated space such as mobile home parks (I'm here), self-storage, mini-storage, note investing.

Looking at anywhere from 20-27% management fees + some other costs, so if you're doing it all yourself and offer the renters an attractive and affordable space, then you're going to see plenty of ADR and cash flow.

There is a brand new development downtown called South Main that will bring 314 new units online this spring with rents starting at ~$1,400 and amenities that include high-end finishes, a year-round pool, hot tub, community BBQ, covered gazebo, private gym, lounge, pet spa, gear workshop, and co-working space.

They are considered vehicles here in California and you park them in a park and pay space rent on top of your purchase price.

I'm looking for a mentor and partner in that space...

Inspectors here often call out a reverse grade sloping back towards the home as possibly causing water to drain towards the home and thus into the crawl space or basement. 

Even for retail space, I see businesses in shopping centers with barely 2 parking spots per 1000 sf when the requirement is 4.

I have a pretty good knowledge of the MF business but admittedly not too much in the general commercial space.