The others aren't so bad - pay on time, keep to themselves, 2 of the 4 have been there 4+ years, no other pets in the building - but all of them pay rent significantly below market and as we start to align it with market value I do think we'll see more turnover which should give us the opportunity to upgrade the remaining units. 

You never want to leave money on the table.As for the pet, @Mindy Jensen , is absolutely correct.

I also know that people like to bring their pets on vacation and would like to accomodate them.

While I might think replacing the appliances in a particular unit is the number one thing that needs to be done, they may have leaking faucets, or a drafty window as their number one pet peeve.  

One of my pet peeves is painting over outlets and wall covers. 

The evaporator coils were dirty beyond repair from pet hair and dirt.  

My dad lives in a condo that has an condo association and they have a rule that all pets must be on a leash.

 $2300.00 per month plus an annual $250.00 as a pet fee.  

:) Basically when you purchase a property for cash, rehab it for cash (yours, HML, your pet turtles piggy bank) you then want to refinance out and get your cash back (the big R at the end of BRRR) BUT there is a catch.

It seems like everyone, their grandparents and their pet goldfish is following this plan nowadays making the market extremely competitive.