My favorite restaurant here in Seattle is Ivers. Seattle Passed a $15/hour min wage. It is staggered and and over a couple of years it fully take effect. Iver's, is a front runner in the policies many of the higher end places have gone. They went ahead and started paying $15/hour. They raised the menu prices to reflect the cost, but most importantly they have taken the TIP line out from the bill, and post signs and notes on the menu, Tipping is not required at the restaurant and the servers are not expected to be tipped.
Did any of the staff leave when they switched over? As a current server, if tipping was eliminated and I was switched to an hourly rate, I would be trying to find another job.