I was also told if my SFH is a 2 unit it would be subject to rent control. 

hey tell us more about that property how many units... is it off market?

I would like to partner with her and purchase a multifamily, most likely a 4 plex, she lives in 1 unit while the others are rented.

Also, please let me know how long you have owned, what floor and stack your unit is in, and what are some benefits and challenges of owning here.  

That would not work for a 3-4 unit home though.

With the discovery of Nashville many investors moved into STRs and so the growing number of units called for the regulation of the industry as a whole.

I'm betting it's a small multi in Miami market where you can OO one unit and rent others, right.   

For newly constructed, purchased or renovated properties and also retroactive generally over the last 10 years, building components are properly classified into individual units of property and accurate recovery periods for computing depreciation deductions.

I have a 3 flat in Lincoln Park, Chicago, IL that I am planning to list for sale in the next 3-6 months.Currently owner occupied in 1 unit (Duplex up, 3 bed 3 bath).The other 2 units (2 bed 1 bath each) are rented.I am wondering if it is more attractive to buyers to leave the 3 bed 3 bath unit vacant when I move out, or should I place a tenant in there and then list for sale?

He wants to purchase a single family in LA county that meets criteria in regards to zoning and size in order to to build 4 homes/units.