Last week, the Portland City Council and Mayor approved an annual $60 per unit fee for landlords to fund the city’s Rental Services Office, which maintains a registry of rental units, enforces fair-housing laws and mediates landlord-tenant disputes. The fee is expected to generate $3.9 million annually and will facilitate the collection of data that can better inform the city’s housing policy. Housing officials estimate there are 121,000 apartments citywide; of those; at least 20,000 government-owned or regulated affordable housing units that serve household up top 60 percent of area median income will not be subject to the fee. The fee is indexed to inflation and will be adjusted to align revenue with program requirements.