However, I saw in my community that some housing development doesn't seem to match the regulations mandated by the city.

Having or not having income and net worth is a choice that people make...it's not a government mandate nor is it predetermined at birth. 

For instance,When the market crashed, the banks had too much debt and the FDIC mandated selling the notes and/or foreclosing on the homes before they would have more cash available to lend.

Why not take a couple days to create a small team of contacts you mandate to be used for all repairs?

I just read an article, which is not in English so I am not sharing, that the Parliament in Portugal mandated that landlords cannot evict elderly (65+) and/or handicapped  if they'd been renting the same dwelling for 15 years or more.

A Loan Estimate (must be that verbiage exactly) is a federal mandated form that lenders are required to show your loan on. 

Mandate proof of liability insurance by the tenant in case the animal bites someone. 

This is obviously an FHA loan and FHA guidelines mandate you living in one of the units.

@Lee V.You are going to have to wait until the mandated year occupancy is over, then you can find another property and house hack again.

Our board’s mandate a new census card (sheet with current info of residents (tenant or owner)) be submitted each year and whenever there is a change.