Clear up the myths, clean up the mythos, and truly get to nuts and bolts of investing.

Hopefully they leave the place in good shape and clean so you can put it back on the market

I'd also have money held back at closing (a significant sum of money) that they do not get unless they are out within the 30 days (or whatever you agree to-do whatever you need to have them treated as a short term tenant) and leave the place clean and in good condition (ie same or better than when you viewed it).

If they choose to leave, then I would give them no more than 60 days to vacate, clean the place up, and rent it for market rate.

Quote from @Branden Rivero: The issue I see is the building is close to 100 years old and with a $500 hoa it's not an easy sale for an investor Yes, thats true however all expenses the past year increase insurance, sewer, trash, electric and cleaning service.

The attic has to be cleaned as well.

If it's your building, and you want to clean it up, clean all of it up.

I started with house hacking and then purchased rentals that were clean BRRRRs.

Those guys aren't cleaning that crap up. 

What you pay with labor will depend on if for instance one of my units still has a good pad and tack and strip then I just pay for carpet and installation cost.What you will pay will also depend on how much you are installing at one time.I don't like Berber for rentals.The design of the loop once it starts unraveling it can unwind pretty good an dis harder to get certain stains and pet stuff out of it.With carpet you want a Nylon carpet even if the cheaper version.Some carpet guys will try to sell you the rubber composite carpet stuff which is the really cheap stuff so it will stand up to tenant abuse.The problem is it can only be cleaned usually up to one time and then you need to replace it again.So I would rather get a cheaper nylon that can be re-cleaned many times over after installation for an additional .10 to .15 a sq ft extra than the super cheap stuff I will have to replace again.If you get 1 sq ft for carpet,pad,tack and strip,and labor install and it is Nylon you are getting one heck of a deal.Even at a carpet place usually you are at .40 to .50 for the pad and .50 to .60 for a cheap carpet.Then you have to do material to install and labor.I have seen sometimes if you have to do a small area you can pick up quality remnant pieces for real cheap and hit that type of number or buy in bulk.