Note I said proper, a lot of companies do not do all of the following that is recommended.....The vent system needs to be checked for blockage and/or leakage.

Your vinyl tiles will let air leakage happen between each joint. 

Air leakage thru walls is now down to zero.  

Such as the roof needs to be completely replaced (there is a ridge sag and seems it could fail, rafters aren't place correctly), the porch needs a larger joist as its sagging down as well, the basement still has asbestos, the basement needs waterproofing as there is a moldy smell and minor water leakage, barely update the 1st floor unit, update and correct the electrical (relocate a fuse panel in a bathroom), brand new panels in the basement with a larger feed coming in, concrete steps in front and rear of house are in need of some repair, the boilers may need to be replaced, replace a few broken windows(completely shattered, just a piece of plywood covers them now), the lower roof gutters were nailed directly into the shingles, there are no GFCI's in any bathroom or kitchen, and a few other fixes.It would be an FHA 203k with 3.5% down$9,600 per year in taxesGarbage is included in taxes, tenants pay gas and electric, owner pays waterThe 1st floor unit is a 2/1 rented for $1225, they have exclusive use of driveway, backyard and the basement. 2nd/3rd floor unit is listed as 3/1, however there is 2 bedrooms on the 3rd floor with a bathroom.

One of my properties in Euclid, OH received a violation from the city during the inspection last year:"The cellar/basement walls show signs of leakage and/or accumulation of moisture. 

Even in other cases of water damage or leakage the water ultimately reaches to the lower portion of home that is basement.

Suction PressureDischarge PressureDuct leakage?

Would you feel confident having a home inspector using a moisture meter and looking for signs of leakage?

Pretty sure Anderson windows carry a lifetime replacement for seal leakage.

When I found leakage in the shower line, first I tried to fix it myself.