The most dirty and frankly UNLIVABLE conditions happen during the following:Demo (especially ripping out lath/plaster or major sections of walls/insulation etc)Major Drywall Finishing WorkPainting leaves a lot of fumesIf you finish hardwood floors which I recommend although will depend on your local market in terms of preferences, you will have to clear out while the polyurethane dries, etc....Here's a few suggestionsDo NOT buy an air mattress, opt to spend a little more for one of those mattress toppers, the foam type. 

Painting the block with dry-lock & running a dehumidifier while not using it as living space is the way to go.

MLS can be pretty dry for finding deals but you never know.

The first crowd will say the second crowd is letting dead equity sit and rot, while those in the second crowd couldn't sleep at night with 7-figures of debt spread between their properties and would much rather low-risk cashflow from appreciating paid off properties.

It may be a great platform for you.For now; keep your powder dry and learn more about multifamily.All the best!

Plumbing issues, oil heat and who is responsible if they let the tank run dry, batteries in smoke and CO detectors....

I believe mobile homes had pex plumbing (as a dry run) well before it hit the markets of stick built homes.Nowadays, these homes are built to HUD code because the factory doesn't know where they will end up in the county.

Most title companies will not do dry closings, and the double-close will need to be funded first by the wholesaler, then separately by the cash buyer.Like I said, PM me if you want to get more dialogue going. 

Unconditioned spaces need to ventilate or they will accumulate moisture, rot, and mold.

And as an example of that, starting in 2016, we've kept our powder dry.