Any provisions that typically are the most critical?

It's critical that you get a professional and competent team on the ground who gives a **** and has the ability to execute an intelligent strategy.   

I thought this would be an interesting alternative to door-knocking (which I plan on doing as well, depending on pandemic).Give me your worst criticism, trust me I want to hear it!!

I think it is critical to have a regulatory body audit the Qualified Intermediary's operations to ensure that it is operating in a safe and sound manner. 

Critical that you have renters insurance.

But beware...you also have to consider the market and what other competing properties are offering.Most prospective tenants are EXTREMELY cost conscious; rental rate is most critical variable...so you don't want to price your units higher than the market and increase your vacancy rates.

Interviewing several experienced realtors to try to ascertain what your property will command will be critical.  

For conservatives, it privatizes a vital government function in a way that even small business people can compete;For liberals, it allows you to personally implement and ensure the survival of a critical social program;The charitable, get to provide affordable housing;The opportunists, get a slice of government pie!

Between finding new markets, reviewing old not used, and reviewing current being used, MA is critical to a REI success...and you're right, there are almost an infinite number of markets available. 

I started a meetup over 2 years ago and it has been critical to my success.