In other words, would a mortgage company have a problem with me using a HELOC towards the down payment? 

Quote from @Kyler J Sloan: My rentals made over $150,000 net cashflow last year, but my tax returns showed around $10,000 income because I wrote off all the LEGAL deductions.

Introduce yourself & your company, answer questions, and set expectations.

The property is extremely mismanaged and the tenants are quite undesirable. 20 of the units are affordable housing tenants and 5 of them are on a master lease with this company who lets the homeless community use the units.

I would still say 17k total is high, if you want some other companies to call, DM me would be happy to provide some to shop the quote

Roam buyers save up to 50% on monthly mortgage payments compared to those who buy a home with a traditional mortgage at current rates." is what the company keeps on pushing out from a PR front, but it just sounds suspicious to me.

The only why my company stops is by written instruction to cancel.

You could rent it to a plumbing company to park their vehicles for $1200 a month3.

My questions are:How do we legally set our agreement and protect our business? 

I own a property management company in Fort Myers and service Lee and Collier counties as well as being an investor myself.