Your main keyword is searched by tenants as often as by owners
The head term in this category carries two opposite intents and the auction cannot distinguish them, so the account has to.
A tenant looking for a maintenance number, a rent portal, an office address or a landlord's contact details searches almost exactly what an owner shopping for management searches. The ad serves to both.
Those clicks cost the same and are worth nothing. Worse, they arrive constantly, so the campaign that looks busiest is often the one leaking most.
Some of it is separable through modifiers. Terms containing words about hiring, fees, services for owners or investment properties skew owner-side. Terms containing portal, payment, maintenance, office or a specific property name skew tenant-side and belong on the negative list.
The rest gets handled at the landing page rather than in the auction. A page that immediately offers tenants the thing they came for, and sends owners down a different path, converts the owner and stops wasting the tenant's time.
Measure it directly rather than assuming. Recording what proportion of inquiries are tenants is a week of tagging and it usually reframes the whole account.