I cannot see how build two, say, 1200 sq ft houses with two roofs, two foundations, presumable about 25-30% more windows and siding is going to be cheaper a duplex that might have a little extra fireblocking and soundproofing.Now, maybe your GC is thinking that detached homes tend to get higher rent than comparably sized and finished duplexes.  

Second, you can take this opportunity to have a conversation with the current occupants and make sure you get all of the people living at the property screened and added onto the lease. 

I've had clients who actually looked at the broker comp commission on the MLS sheets and that would drive/tie-breaker their decision.So, I think it will be really interesting on how the market fragments depending on the relative size of the groups of buyers...

Thorough screening and understanding of your tenants.  

I'd reduce the size of your units and stick more to 1 bed and 2 bed than what you have the numbers aren't really looking good on this deal. 

Bathrooms will take normal size tub/shower and smaller single vanity. 

If you look outside city limits make sure you do some research on the septic system, your lot size, if you even have room for a backup field , the ability to replace septic is becoming a real issue statewide. 

I would speak to your property manager and go over their screening process with them.

They consider factors such as property type, location, and size.

Go to BUILD YOUR TEAM at the top of the screen and look for local investors or meetups in your area.