Historically, the average annual price appreciation of a King County condominium since 1990 has been 2.9% (this includes the correction and recovery following the 2007 peak values and the result of the great recession). Interestingly, apartment rents have rise 35% since 2010 and overall, condominiums have risen just 6% during that same time period but are expected to accelerate as supply and demand imbalance plays out.