Your best bet might be joining a local real estate club.  

I mean, as a building, they are probably the easiest to physically expand, are you also pouring a slab?

As low as the market went for mortgages and housing shortage, the only sure bet in my opinion is housing prices will continue to rise. 

Your best bet is to ensure that there are no material modifications that would in any way harm or even moderately delay the ability to rent it out and qualify as a normal SFR (one lease, one family) or sell on the market to an owner-occupant

Best bet is talk to wholesalers and have a real good agent that can dig properties out, and be prepared to buy on spot in good locations and anything else be a tough cookie.

Is it 83% physically occupied, or economically occupied?

@Srinath Gopinathan, I'm sure you can physically go to the assessor's office and get this information.

I bet passive investors had been working with coaches to underwrite the deals they've been investing in the past two years.

I would like to know which physical areas I should focus on. 

Best bet is to go talk with some local banks and commercial lenders bc most likely that's not gonna fly on any kind of conventional loan.