(Portland, WA)  --  A new report shows the cost of renting a place to live in Portland may be on the way down.  Rental-housing association Multifamily Northwest says the rental vacancy rate in the area has risen from two percent five years ago to between four and five percent, meaning rental rates could soon level off or fall.  Economist Jerry Johnson tells KOIN-TV there's now more supply of rentals to meet the demand.