The upper unit is fine, but the lower unit…former smoker lived there.

Long term, I plan to install a couple of air grilles (like a return grill for a furnace or A/C) on both sides of the wall next to the door, and make up a 4" long sheet metal "duct" to join the grilles.

I went up there, and sure enough there were inflatable beds in the rooms, portable refrigerator, barbecue grill, etc.My question is, what do you think is the best way to handle this?

I wouldn't do multifamily over a quad here either.Best of luck and check out Desoto Grill in Kalispell.

I don't send the Cozy background check request until I screen the hard copy application for income requirements, pets, smokers, etc. 

There was  a smoker in the house and I am wondering if this is the cause. 

Since they were meth smokers, this will probably be all surfaces, which you don't want to remove.Clean- ALL remaining surfaces.

The smell is apparent, at least to non-smokers like us.

We will be installing a playground (lots of families and young children living at complex), common grilling stations / seating areas, and update the club room above the leasing office for an after school study room.

Shoot I was one myself ) this building will be 1 block away and cross the street from campus with all the bars and restaurants  the other new complex do have pool but I think the distance and little cheaper rent than other new building. will attract students more  2  the old buildings around it  all have evaporated cooling ( which sucks bad on really hot days down here )  our will have central Ac  3  I was thinking of building a gated capmlex  to give them little something different 4  will have  washer and dryers  on site ( coin operated )5 will have masters bedroom set up  each person has his/ her own bathroom  6 if there is room left on the lot we can put little shade stricter and build it grills  Around us  1 bed room renting $450-500  2 bedroom  $685   In the old building  I was thinking of renting 2 bedroom -735    And 3 bed room  for 850    1 bedroom for $535  Project cost with lot will be about $1.2 -1.4    20 units will average at 680 a month $13,600 a month gross