I’ve done iOS development in the past with Obj-C & Swift but these days I’m mostly doing web development with React and Node.js.

There are many Non-QM loans that will allow a long term I/O payment with competitive rates.

At that point you should be able to cash flow with a stabilized property and can look for I/O financing (typically Freddie Mac if you want a longer I/O period).  

This has its pros and it’s cons, including taking longer to find opportunities that pencil, but it has the pro of knowing where you will be from a fixed rate situation, usually there is 12-24 months of IO in there to help stabilize before a capital event in yr 3-4 etc.

Actually 3 apps - web/desktop, Apple iOS, and Android. 

I've sold SF Interest only (IO) many times. 

If you get an area rug, make sure you get a rug pad as even an area rug will scratch hardwood.Is your type of hardwood engineered?

Even plunking down another $3K to refi into a perm loan puts you at about $80K, of $532/month fully amortized (not IO like your loan) for 30 years.

You do also see an IO option on larger loans for stabilized property through Fannie Mae or Freddie Mac. 

I'm also not a fan of L/O's to buy since you have so little control, but you can do sandwich lease options if you thought it made sense.I did one where the owner bought the house for his son and financed it at 5% I/O, that thing cash flowed pretty well, but I stumbled into it and pitched it because the guy was loaded and had bought the house for his son who was a drug addict and trashed the place and he wanted the headache gone more than the money.