Its hard to discount a general slow down in appreciation simply due to the economics of increased supply, but will I really lose a lot of value or have trouble selling my condo if in fact the new product is simply a different market?

Turn key companies get substantial volume discounts on supplies, materials and mechanicals.3.

Most all supplies are in the apartment to put it back together but it's still a mess.1 unit has a roof leak that was improperly fixed (still leaks) and hasn't been messed with since.Tax are 3000 annuallyInsurance around 1200 or lessHis asking price is 165,000 would seller finance with 10% down.I offered 140,000 with him carry the note with 20k down on a 2yr balloon at 5% interest.His "Realtor" said he spike with the guy and he wouldn't do any less then 165k.

I have Excellent credit and ample funds in case of repairs etc.Also the home is in a very good area (close to schools about 1500 sq ft 3 bed 2 bath) Also my brother and father are contractors so that always helps for future maintenance.I thought without paying any realty/ closing fee's this could be a great and profitable way to get my first single family rental going.Any advice/ guidance would be appreciated!

For example, in four 4-unit buildings this is what the rents look like. 585, 610, 615, 585, 585, 615, 630, 585585, 615, 630, 585, 585, 615, 630, 585I'm guessing that some of this variation is due to supply and demand (winter and summer) but are there any other logical reasons as to why this would vary $45 between the high and the low? 

Call the Town, ask them who supplies water to that town (could be the city or could be a semi-private company. 

Short inventory is a problem as it continues to create pure supply issues and raise home values (to levels hard to imagine). 

However, if at a later date, it surfaces that you did violate the intent of the arrangement, like your future interest holder sells, that's a different matter.There is no due on sale jail, there is bank/mortgage fraud jail, supplying false information to a lender. 

However depending on the load of your house you may be able to get away with one head, especially with a open floor plan.4) You need to talk to a installer/supplier to see how many BTUs it would require to adequately supply your home and see what your options are. 

I would try a Menards, ABC Supply, or Sutherlands.