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.  

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. 

Ok I will check those websites out, Thank you.There's a variety of ways to get a deal in front of you (I'm mostly a flipper), but basically if it looks promising, I run custom comps queries and check the current & past $/sf of renovated/distressed product in that city or zipcode.Here's a chart on 90066 I generated from my tool under Market Stats > Sales Data > Specific Zip Code:- My above chart (more available) shows the Avg Renovated $/sf (High) over time in this Zip Code, something completely different than charts/providers based on Averages/Medians only, like every other platform (RedFin Below, https://www.redfin.com/news/data-center/):- Can't select smaller locations such as City or Zipcode for their $/sf data, so it's useless helping me underwrite/verify a deal.- Can set Zip Code for Median Sale Price data, but again it's the median/avg so it's useless helping me underwrite/verify a deal.Then if that looks decent, I'll run Sales Comps, and get a quick summary of some key metrics based on those comps.

What else if any one has a nice flow chart and guide me i will appreciate.Regards,namal

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

It's a matter of preference but I have seen a lot of owner operators your size and bigger using Buildium.

Depending on the size of the project - that can eat up a descent chunk of money.  

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. 

How many townhomes can fit on the site, assuming 1,850sf unit sizes?

LOL, though size of the house is related to rent and the number of things that can go wrong).