If you have nothing in writing, the lost rent is your tuition fee to school of hard knocks.

I would stick to old school tape measure and measure each room 

We were able to list it just as school was ending about 2.5 weeks ago.

There's no magic bullet here.

When school is out then turn the apartments into an STR.Another approach since the goal is to build generational wealth with passive income is to build up your current cash reserves through a few fix and flips, then use the cash to purchase and hold.

I will be selling my home in June when our kids finish school and then relocate to Florida.

If your son is a student does he get a discount through the school?   

Hello, I'm 17, and In 1 year after I finish high school in Romania, my family and I will move to the USA, we have 100k saved up.

About a year later I joined the Navy and we moved out to California so we rented out to a school friend of my wife's, essentially stumbling into a rental property.

It's a bit old school but the price is reasonable. there're better systems out there but you pay for the premium.