Concrete:  $75 a yard installedBrick:  $.50 per brick installedpainting:  $100-150 a room with trimexterior painting: $1800-$2500new hvac : $2300new window:  $100-$150 for standard sizes x 2 for installdrywall : $12-$18 a sheet finished (depends on finish level and size of sheets)tile: $5 a square foot installed (add material cost of between $2 and $10)basic stainless appliance package : $2500hardwood $2 a sq. foot installed $1 a sq foot to refinish (add material cost of $2 to $10)plumbing:  $100 per fixture to install and $100 per fixture rough-inelectrical: priced per outlet and per fixture for both rough-in and installTotal rewire of house:  $3K-$6Kupgrade electrical service:  $800Total replumb of house with pex (no slab): $2K - $5K10x10 set of cabinets no frills:  $2500, about 1 day for a capenter to installcountertops: $1500-2000new roof:  $5K (metal including materials)deck:  $2K-$5Kbulldozer/bocat:  $80 an hourdumptruck:  $1.50 per mileCarpenter:  $35 an hour low end + $10-$15 an hour for helpers. 2 carpenters can frame an entire house in less than a week.  

Do you still live in a portion of the home?

Do check the county property appraiser site to be sure their info. on structure/size matches to what's there.

Its a 4 unit, so I suppose I'll be looking at comps all day to see how it sizes up. 

We are a small to mid-size town of 300,000 (600,000 metro region), situated between Columbus, Detroit, Cleveland, and Chicago.

A lot of people, myself included, would jump at the chance to be mentored by someone, If I should make a portion of the prophets, Great!  

Generally , these homes should be close in location, layout, size, age, and condition.

Things like fungus damage of the subfloor, support posts in the crawlspace in soil contact, hairline cracks, and (scariest to me) no foundation on a portion of the structure though majority is pier and block.  

Also something I didn't mention is there is a generous sized fenced in back yard with a garage.

When building spec homes, how do you determine the size of homes to build?