The Airbnb competitor says it tripled the number of rentable units in its online marketplace last year with more than 8,500 spaces in 20 cities around the world available today.

“The future of hospitality will be dynamic,” writes Sonder co-founder and chief executive officer Francis Davidson in a statement. “It will demand flexibility. And that’s what our diverse, unique and adventure-seeking world is like too. That’s why, while our spaces will continue to take on new forms and expand to exciting neighborhoods around the world, a Sonder will always be unforgettable.”

Related: What is Sonder?