"We're seeing rates go up from $100 to $500 a month," said leasing specialist Ashley Hayes.
The average price of a one bedroom is expected to climb 4 percent by September to $1,271, and tenants are ticked.
"What they're going to do is out price people from ever living in the city," said Kirk Ludden.
Despite tons of new construction in Seattle, inventory is extremely low, and some landlords are riding that wave.
"Not only are the rates going up but the owners are not wanting to sign long-term leases," said apartment manager John Evans. "What they want to do is have short term leases where they can continually raise the rents."
One rental adviser says it's all a sign of in migration. He follows drivers license data and found that in a typical month in King County, about 4,000 people from out of state turn in their driver's license for a Washington state license. But in June, that jumped to 6,000.
"Relocation is the number one factor right now," said Ashley Hayes of the Seattle Rental Group.
Hayes helps relocate people for corporations and says the influx of new Amazon employees is changing the rental market -- they're not ready to buy, so they rent.
And homeowners who've been renting their houses for a few years are contributing to the tight inventory too.
"They're pulling those homes from the rental market and putting them on the sales market cause the sales market is doing quite better so it's kind of taking away from the inventory as well," Hayes said.
Hayes says it's even tougher to find single family rentals than apartments. But in nine months when the high rises deliver more rooms, and the inventory evens out, analysts predict the rental market will relax.