Recently purchased a SFR but now I'm seeing some moisture issues around some windows.

If there is a dirt floor in the basement, be aware that the excess moisture can rot out the floor from the underside and can be more prone to pest infestation from burrowing. 

I have a few small cracks in the popcorn ceiling from moisture.

Seems pretty reasonable to me as a host who pays my cleaning crew all of the cleaning fee and much appreciated as a customer who has been blindsided by excessively high cleaning fees.

If you choose a city that has a lower cost of entry point but a nice level of rental cost you could use an FHA loan that requires 3.5% down and live in 1 unit for several years while the other three tenants pay for your mortgage and bills and hopefully generate you excess cash flow to bank into your next down payment fund.

If you are asking for that to add me to your buyers list, it seems kind of excessive.

Either way, I am providing a solution (shed), but they need to figure out what to do with excess items if the items can't all fit in the shed.

I had a painting crew come who said it was because of moisture from poor ventilation in the attic. 

The "excess" suspended losses will pile up on your books and can be used to offset passive gains.

The plan would be to rent out other unit(s) first, then see if any friends/family want to rent out excess beds in my unit.