What happens if you are no longer allowed to lease your unit or alternatively there are too many rented units and the building is no longer warrantable for owner occupant borrowers?

I only allow tenants to pay on the 1st of the month but I would consider alternate payment schedules dependent on the situation and tenant if they asked.

Is there an alternate source of heat?

Not when there are so many alternative methods of engagement towards resolve of which past clients have appreciated.

Transitioning to a Second Property with Low Money DownIf a second FHA loan is not an option, here are alternative strategies to minimize your out-of-pocket expenses:Conventional Loan with 5% Down: Once you’ve added equity to your current property, consider refinancing into a conventional loan to free up your FHA eligibility.

Over time, I’ve accumulated more cash reserves and don’t need as much flexibility, but I’m actually in the middle of a refinance right now using an interest-only mortgage—because the pricing with the lender and the corresponding ARM is more favorable than a comparable principal-and-interest loan.The key with these alternative or "exotic" mortgage types is that you need to be financially savvy and have a solid plan.

I would look at wisp as an alternative comparison when talking to realtors. 

Pretty,  as others have stated here, the permitting process through the City of Cape Coral has been hindered by their ability to scale up their staff to handle the massive demands for all permitting including new construction but also anything else that requires a permit, home improvements, sea walls, alternative sea walls, pools and more.From your post, I can see that you are frustrated, and I believe some of that is due to not understanding the steps and processes of new construction, including what must be done prior to submitting permits.

Other than that not too much you can do, the only alternative post-closing would be to offer cash for keys for someone to move out quicker, but if it's short notice to vacate period like 15-30 days than it's probably cheaper to wait. 

There are some very good alternatives to using QB, including Xero and Wave.