This is your home so I would suggest a much more stringent vetting of the tenant.

It measures the opportunity cost of keeping the property vs. selling it and investing in more cashflow.

And 36 Other Key Financial Measures" by Frank Gallinelli"Aggressive Tax Avoidance for Real Estate Investors: How to Make Sure You Aren't Paying One More Cent in Taxes Than The Law Requires" by John T.

Single family homes vs garden apartments vs high rise apartments will all have different ratios and within those classes, will all have different results in different states.It is not possible to get the number you are looking for as an accurate across the board of all investment classes for cap ex or repairs/maintenance.That said, here is a blurb copied form the NAA (National Apartment Association) which puts out data on operating and cap ex expenses for apartments of garden style and high rise: “Capital expenditures, which can include anything from concrete and masonry work to amenity upgrades to extensive rehabs of some units or a clubhouse, has steadily increased since 2010 when measured against GPR.

If a structure is in the way they will take whatever measures are necessary to move it to get there job done.  

I’d like them to come out and measure - cut - and install - ready to do the job now!

I am not an economics expert but CPI is one way of measuring inflation and deflation. 

Just be sure your tenants pass your stringent qualifications.

IRR is the benchmark most investors use to measure success. 

What Every Real Estate Investor Needs to Know about Cash Flow...and 36 Other Key Financial Measures by Frank Gallinelli2.