Prices has gotten higher in some of the largest cities in the world, but Berlin is growing the most, with a 20.5% percent rise in 2017. The average price has actually jumped almost 120% since 2004. This rise is hitting other markets including Vancouver, who recently implemented a 15% foreign investor tax just to curb people buying in the city when they weren’t planning on living there full time. Experts are wondering if a bubble is on the way in some of these markets.

Read more: Berlin tops the world as city with the fastest rising property prices