I do periodic maintenance - like checking/replacing A/C filters, smoke detector batteries and any other routine maintenance.

Ace A. on #1, there are smoke detectors that have 10-year batteries.

An Example addendum I use for Florida a Tenant friendly state "Security Deposits and Advance Rent, Security Deposit is Not for Last Month's rent, My ability to inspect the property, Smoke Detector battery maintenance, Mold (Tenant will use heat and A\C to prevent Mold). 

Battery will have to be changed occasionally.  

If I'm reading this right, you need to change the batteries in your calculator.$33,000   Cost to Buy$14,000   Repairs$47,000   Total Cost$75,000   ARV$60,000   80% ARV (Refi loan)$47,000   Cash in$13,000   Cash OUT (as in profit built into the loan)You're not upside down.  

Think marketing fees, credit card fees, house visits, toiletries between each guest, batteries, light bulbs, propane refills, etc.

I do not do CL.For used appliances I use stores, one is strictly used, reconditioned with 1 year warranty.

These are the ones that can't figure out the battery is dead in the thermostat or they replaced it wrong.

New batteries in smoke detectors.

Then I stopped by BassPro, bought some fishing gear and a new battery charger, met a couple standing in line who are moving to the area a need a house, gave him my number, well, I just happen to have.....they want to see it!