Xenotime St. is a small east-bound street located in northern Algonquin, Liberty City in the neighborhood of Northwood. The street is where Playboy X's penthouse is located where he lives and assigns missions to Niko Bellic. The penthouse can be obtained by Niko by killing Playboy X during the mission "The Holland Play" where Dwayne Forge allows Niko to keep the penthouse upon completion. Before that, Niko would own the Third Safehouse in North-Eastern Algonquin. The street provides a residental parking space to the player with room for two vehicles. Armando Torres and Henrique Bardas also dealed drugs on the corner of Xenotime St. and Frankfort Ave. before deciding to steal drugs from various gangs alongside Luis Lopez for a better profit.
- Xenotime is a rare earth phosphate mineral, whose major component is yttrium orthophosphate.
- The parking space in front of the the penthouse is still usable by Niko even if he did not kill Playboy X during "The Holland Play" or complete the mission, similar to all other parking spaces in the game. The parking space is also usable by Johnny Klebitz and Luis Lopez in the Episodes From Liberty City expansion for the game.