anyone own rental properties on here?

All my properties started out mortgaged, and re-mortgaged.
My first property I had saved $7k of the $21k price, big up and down duplex with full height unfinished basement.
Got married, moved in, spent 2 -3 years building a rental suite in the basement.
Re- mortgaged for enuff for down-payment on another home, the rent from the basement paid what I borrowed.
Same thing, finished basement rental suite, shot roof up for a mstr suite, now 3 bdrm, re-mortgaged to buy lot to build family home, did same again and bought acreage,
Sold 2 to buy motorhome and pay off mortgages, spent 5 yrs cruising the USA, sold another when I retired early.
The banks loved it cuz by improving the property right away, it was always worth more than the mortgages, and bottom line was no matter what happened, I always ended up with one home free and clear.
Yes I had the "quick-crete" down the toilets, and used kitty litter filling the hot air vents, and "pet rooms" you pulled the 4 corners of the carpet together, and try to get that sack of **** out the door.
Limit rent increases to when changing tenants.
Rents go up, mortgages don't. ( Rates were near 18% waaay back when I started, 1970)
The worst night mares were the "welfare" cases that KNOW how to work the system . . . Hence the golf-club . . .Lol . . Funny now, NOT then ! !
Good Luck .