I was envisioning a two part calculation for the monthly mortgage payment - I see it as a VA loan analogy with no money down but the loan structured with two interest rates (one for the TSP down payment and one for the 30 yr fixed rate mortgage).I guess the real question to ask myself (using your situation as the model, assuming positive cash flow once TSP is repaid) is whether I am okay tolerating the potential 60 months of negative cash flow to get to the positive cash flow after 5 years.- Maybe if it gets the deal going and leads to a cash out refinance before the 5 year mark that allows me to speed up the TSP pay off.Wow - Great food for thought. 

Your business model cannot be sustained. 

I'm using my latest acquisition, the Tampa property, as a model for my new investments. 

Or if you buy a duplex, live in one side, and work the deal so the tenant is paying all or most of the mortgage (some circumstance like that).Buying a rental house (or 20) the right way, and renting them out forever is one of the best passive business models I’ve ever experienced.

Leverage your expertise, operations and understanding of your market to add vertical services to your business.

When we get awkward 2-3 week gaps and have to switch to an STR model, it's a PITA because we're cleaning ourselves.

I know how to build models, I know the lending process, and I'm an excel junkie.

It's a scalable model if you have a solid team built out to help you manage scheduling and checking out. 

That is certainly your area of expertise.

One model I’m seeing investors doing is the rent by the room strategy / padsplit.IF done right, you can turn a single family home to function like a multiplex - increasing the cash flow by double, even triple oftentimes.Has to be the right property of course / layout / characteristics to minimize drama and conflict between roommates / tenants since it’s a longer stay than STR and spaces are shared but with the right set up and systems in place in can be extremely effective and super profitable.You can easily switch from STR to MTR since it’s already furnished and just make a few tweaks.I can definitely help you put some ideas together or connect you with some investors I know doing it in Jacksonville FL.