This may seem off thread, but I suggest not.
22.5 years ago I invested €13,000 in an investment property, borrowing €115k. Since then I made repayments of €150k (it was a 15 year mortgage) and collected rent of €211k. The property today is worth €250 approx. I am still collecting rent on it.
Sounds like it is only relevant, when the taxes, due on the rent are factored in, plus the other running costs, (LPT, maintenance, Insurance etc)which in many cases is up to circa 50%+of the rents received, as it appears the mortgage paid off, so no interest to write off against gross rents.
Others may argue the CGT due on the sale of the property may also relevant.