You shouldn't wholesale deals on market as it's a conflict of interest. 

Lesson learned on going into business without exit plans, I guess...For reasons out of scope here, I just filed my 2021 taxes and the IRS hit me with a $30k capital gains bill (not including interest or penalties).

What are some companies you've worked with, pros/cons of their business and amount in fees they charge?

Ok, I'll bite.....give an example of a home that is affordable, sustainable and desired by many.Remember it is critical that you as the business owner (and your partners/investors) make a good profit after paying overhead and operating expenses.

Business credit & personal savings How did you add value to the deal?

As everyone has stated, HML are normally for business purposes.

I use Appfolio in our business for LTR and we really enjoy it.

I've seen conflicting information on when/whether these costs are deductible — most, including Pub. 536, seem to apply to the *purchase* of a rental property, and resources that deal with sales have focused heavily on either straight-up sales with capital gains taxes or on 1031 exchanges with deferred gains.

Yes you can use the cash out proceeds to payoff a mortgage balance for an investment property since it is still qualified as business purpose use. 

LLC's are more used by larger investors and people who do not qualify under their personal names and have to ue business purpose loans and they require the property be in an LLC and not an individual.