Don't forget property tax implications to a possible change in ownership as well, and whether formation of an LLC as a rental can help with property tax savings or not. 

I would definitely not want to make the change, and then regret it.

I suspect it's due to the change in the housing market and economy.  

Class A- Brand New buildings with lots of amenities, good infrastructure & locationClass B- Building are usually older; priced less than Class A & need some updates/restorationClass C- Oldest buildings (20+ years); need significant maintenance; less attractive locationsWhere things become subjective is an older building located in a neighborhood that's changing for the better. 

If I read this correctly, this essentially changes the 2 of 5 rule to 2 of last 10?  

Would change the rate but you can keep the property and reinvest to expand your portfolio.

You might want to limit your visits though to avoid escalation.Short term if the smart lock is on his personal door just change it to a key if it's isn't working for him, you can always switch back later.

A year into my multifamily journey everything changed.

This was done to protect senior citizens on fixed incomes from being forced to sell their homes due to unaffordable property tax increases.Since the passing of this amendment, all properties in Michigan have two property tax values associated with them:State Equalized Value (SEV): supposedly equal to 50% of the market value of a property, not based on recent sales price.Taxable Value: the SEV annually capped as long as there is not a transfer of ownership.City Assessors are charged with determining how much property values have changed each year.

However, if you don't know the layout here, it's best to get with those that do as properties change street by street and sometimes even on the same street.