@Matthew Loring,
Thanks for responding, all good and relevant points. My house in the city was built in 1900, so an old house, though fully renovated. My house in the city was built in 1951, and also fully renovated.
I consider all costs, except for taxes and insurance, in order to comply with local registration requirements and to keep a property in a good market condition for the area, to keep your property competitive with others. For example, included in my numbers are replacement of an AC unit and roof in the county side house, and replacement of kitchen counters in the city side house. The city side house is in Canton, and I replaced Formica counters with granite when the existing tenants of 4 years moved out. In order to keep pace with other rentals and get what I consider "market rent" for the area, that was a necessity. All of the annual property and lead renewal/registration costs are included as well. The county side house was purchased as a foreclosure, and I made about $7k of repairs/upgrades prior to renting it out (those costs are not included in my annual cost numbers, as I consider those up front costs to make property "rental ready"). The roof and AC replacement were done about 3 years after tenant moved in. I expect in cases of foreclosed properties, costs such as roof and AC replacement may come up sooner rather than later.