My average is $150 per call.

Stockton, CA Average Home price Data From August-October 2021RedfinAugust $422,750 September $421,250 October $403,000ZillowAugust $421,000 September $429,000 October No infoRealtorAugust $425,500 September $420,000 October $400,000Sources:RedfinRealtorZillow

The more accurate way would be to estimate how many service calls your property will need each year(i average 1 per year per unit) and the cost to repaint between tenant turnovers.

You can cancel when you've made your decision, which, all things considered, is a very important one - ie don't skimp up front.You can use the low end of the averages if you want to be conservative.

The utility company will give average usage for the specific house.

You can actually google 'Fannie Mae 1038' and download the form yourself and fill it out based on your 2020 tax returns to see what numbers you come up with. 

I have not been able to hit 1% there but have been happy with a good balance of low cash flow, higher than average appreciation.  

@Darren FergusonI would suggest downloading a Storage App to keep track of your receipts(Google Drive, Dropbox, Apple Drive, etc)Best of luck

@Joe Splitrock is correct, for the historical averages, although we are not in a normalized market by any stretch right now. 

Freddie Mac was recently predicting 3.7% average 30 year by Q4 2022  along with almost 7% annual price appreciation in their quarterly forecast. http://www.freddiemac.com/research/forecast/20211015_quarterly_economic_forecast.page?