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.

Many skip tracing companies have a minimum count or spend.

Did you self manage or use a Property Management Company? 

Renegotiating some utility contracts (garbage and removing some on site office paid internet/phone bills) 5.

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

The down side is that STRs are more work, need to furnish it, pay for utilities and WiFI but in the right market (vacationers and business travelers) it could work. - If I were looking at cash flow as a really important important metric, I'd consider starting a business.

Some companies allow property owners to select tenants and set the screening criteria...We do not - our criteria does not bend. 

ALTA survey, utility survey, etc.$100k per building, I'd say not usually. 

Nobody wants to be a "GM" in a company of 1, right.

There's more low-hanging fruit here than I'll ever need, but hitting the ground running to pick it before land prices start reflecting the new higher values requires more capital than I have and I don't do debt.There are two main companies in the US who do the work of creating and selling eco-mitigation credits on a joint venture basis, separated by the Mississippi river.