Should property fees be added to the rental-to-sale ratio?

It depends on how the lease contract is written.

If the rental contract says that the property fee is in the rent, add it. If you don't write it, there is no need to add it. Just go to the property and pay the property fee yourself.

Generally, invoices for house leasing are issued by the tax bureau, in which the agency fee cannot be combined with the rent (that is to say, the project must be clearly written and the company keeps separate accounts), but it can be issued on the same invoice, but it must be itemized, and the water and electricity fees must not be included in the rental fee.