Thank you  The good GCs charge 20% but this does not equate to your savings because the GC will have better contacts, have namer experience coordinating contractors, be more familiar with permit process and expectations of the inspectors.  

You could front the down payment as well as monthly payments to the seller, then charge interest on them.

@Gene PanicciaManagement fees vary, but it's not uncommon for a PM to charge fees for managing tenant-paid utilities or coordinating repairs.

I financed the deal with a conventional loan and bought down the rate from 7.75 to 6.25.

If not, you’re probably better off with a more conventional approach.  

First thing I'd do is check comps to get an idea of the demand and rates you can charge for your condo as a MTR.

I believe United FCU is best. 20% down, usually a 10yr term (they offer a longer term though), and an interest rate that's pretty close to the current average for conventional loans. 

I'd rather keep the sub-3% rate for now and finance other properties conventionally for the short term.

To fund your next deal, explore conventional loans (15-25% down), FHA loans (3.5% down for house hacking), DSCR loans (based on rental income), or HELOC/cash-out refinance if you have equity.

BUT The points they charge and interest are both way higher than normal, on some deals I ran numbers the points and interest were going to be 20k on properties where the ARV is 100k so you have to get properties at such a low price to make it work that it is so hard.