DSCR loans are used to finance the property once you have tenants in the units.

They had about 90k into the property.

I'm a 26 year old from Long Island hoping to acquire my first rental property by the end of the year.

They had about 90k into the property.

I'm looking to exchange a multi-use property I own in the Bay Area for a multifamily property in Phoenix (looking at 15-19 units).

You are losing money on both properties. 

When I worked with a property management company, we had someone buy a unit (single family) that had a STR and marketed it as a STR.

I have reached out and spoken with the HOA management property manager myself, and just keep getting BS excuses and no sense of urgency on this matter. 

I would look at the DSCR loan as the first option.By the way, I suspect you are going to be disappointed by any refi appraisals   ADUs typically appraise poorly   JADUs can lower the property value Vs having the space as part of the primary unit.  

Driving by a property today to see if makes sense to walk.