I’ll take the median area income and multiply it by .3.  

He's a CPA/CFP and is well versed in this area.

I own a 2.25-acre property in Cypress, TX, just a 3-minute walk from Cyfair Town Center and top-rated schools (rated 10, 9, and 8).

My goal here is to learn and to understand. 

Purchase price: $720,000 Cash invested: $60,000 Househack/BRRRRR.Taking advantage of low 5% down Owner occupied conventional loan, then fixing up the units 1 or 2 at a time, raising the rents, and then refinancing to lower the monthly payment and increase cashflow. 1 full gut unit and others were more cosmetic turnovers.

And should I state this as a reason as to why his rent is being raised.  

These days, every MLS syndicates to sites like Zillow and Redfin, so you are likely seeing every house on the MLS on Zillow/Redfin/etc.

I also require the tenant to have renters insurance with liability coverage for me and them.

MF is generally harder to find and purchase economically. 

One was leased for $5800/m to a credit tenant and the other was a corner space that had a 3 year old HVAC system and ventilation system in the kitchen area already installed.