The companies that market themselves as "garage door companies" (residential) also almost always do commercial stuff as well, such as what you are looking at.

Personal loans through the credit card companies can be approved and fund very quickly and my best rate is 7.9% so shop around as some are much higher.

Biggest gains are if you do it out of your IRAs.

After reading Brandon and Brian's book, The Multifamily Millionaire, Volume II: Create Generational Wealth by Investing in Large Multifamily Real Estate, I'm a bit puzzled as to if the GP's must have real estate experience, or if someone can connect enough professionals/companies on their team to execute successful investments.

See the chart from Fair Isaac Company (FICO) below: FICO Score Pct of Population Default Probability 800 or more 13.00% 1.00% 750-799 27.00% 1.00% 700-749 18.00% 4.40% 650-699 15.00% 8.90% 600-649 12.00% 15.80% 550-599 8.00% 22.50% 500-549 5.00% 28.40% Less than 499 2.00% 41.00% Source: Fair Isaac CompanyAccording to this chart, investors should use corresponding vacancy+tenant-nonperformance factors of approximately 5% for Class A rentals, 10% for Class B and 20% for Class C.To address Class C payment challenges, many industry "experts" are now selling programs to newbie investors about how Section 8 tenants are the cure.

Or does one need a special license / need to open a company?   

Many skip tracing companies have a minimum count or spend.

Waivo is an example of such company.

You're using a company to manage tenant phone calls/inquiries and then send in vendors for repairs.

What other company offers business income loss and up to 15k for dealing with squatters?