Movin' on up! The Weeknd just dropped $21 MILLION DOLLARS on a condo .. yes, a CONDO! No yard, no pool -- just part of someone else's building. But hey, that's what you do when you've got money to burn!

The singer and ex of Selena Gomez and Bella Hadid originally had a starter home in Hidden Hills two years ago for $18 million -- cheap! Abel Tesfaye, 29, will likely use that old shack as a weekend (no pun intended) home and his new digs at Beverly West, a 22-story tower with 35 units that overlooks the Los Angeles Country Club, as his Mon-Fri residence. The new four-bedroom dwelling spans the entire 18th floor of the building. That's what's called a penthouse, folks.