To get some insight into the development process, take a look at this thread I am writing, walking through an actual multi-family development project in SoCal: Life Cycle of a CA MF Development ProjectI am an offer of help, feel free to post questions here or you can send DM. 

If you can do a value add and BRRRR it, that really makes the most money.  

sec edgar search. you will need to know the name of the actual entity - but also you need to understand the process, as the SEC does not tell you who is or is not current, you need to understand the filing requirements etc. 

It looks like you are not able to get lending because your Debt-to-Income ratio is too high.You should figure out what your DTI ratio is.If you are buying cash-flowing rentals, your rentals should actually be helping you get future loans easier.

I don't have large money to pay off the that lien.

Does anyone have recommendations for an STR on-call service (not full property management), which will handle basic guest communication during their stay and handle organizing repairs (i.e. calling a plumber, HVAC, etc. ... not actually doing repairs themselves)?

Id work the DSCR route and Use the stacking method......1>2>4>8>16>32>64but but make each one of those Duplexes and not actual doors......1 duplex, 2 duplexes, 4 Duplexes, 8 Duplexes.

You’d be shocked by how little actual screening many PMC’s do!

Follow the money.

Only loan that would cover your rehab is an FHA 203K (primary residence loan) OR hard money fix and flip loan and you would have to refinance later.