what it sounds like you are asking is illegal in many ways, section 8 laws, local laws, duel contract laws that conflict, there always has been also those out there looking to catch you breaking them,  avoid it, dont offer it, dont entertain it, there is leeway up if the tenant meets certain conditions, say need 1 floor rental, if not rent may be inflated over realistic market, which is what rented at not listed at, keeping in mind sec 8 market rents also include utilities paid, you can usually reach by email fastest, they have set chart, heat type, neighborhood etc, more than listings found online

This chart basically shows me which City's are most desirable (can do the same with Zip Codes):Anything to the right of 0 means the $/sf is growing QoQ on average, and the height is the current $/sf of that market.

Calculate the size of front and back, then do the math.

Depending on the size duplex you get market rental rates are $1000-$1250 in Lehigh Acres. 

My experience on the forums is that everyone who touts a one-sized-fits-all system is (when you look at their profile) a paid teacher, coach, guru, etc.

Sometimes a BPO does not get us comfortable enough with a property and a full appraisal may be required dependingon project size and other factors.

These charts show data across each market on rent trends for re-rentals, where a new lease is signed on an existing rental property, and renewal leases, where an existing lease is renewed for an extended 2-year period.These data graphs show the percentages of growth and the number of leases in each category by city. 

It is also near a massive medical campus that is constantly growing in a decent size metropolitan area.

In all of that time I've only had one situation that I would have kept any part of a security deposit for "damage" (to replace one new set of king-sized sheets.)

Once all of the above is known, and you have a preliminary site plan showing how many lots (and the size of lots) are available, you can start putting together numbers on the cost of the whole project.