https://techcrunch.com/2018/02/06/spacex-landed-two-of-its-three-falcon-heavy-first-stage-boosters/

SpaceX has managed an incredible feat alongside its historic Falcon Heavy first test launch today – landing two of its boosters at once, nearly simultaneously, intact. The first-stage rockets used during today’s launch included two flight proven Falcon 9 boosters previously used during missions for SpaceX in 2016 and then refurbished, which landed at their intended destinations after decoupling from Falcon Heavy’s second stage and returning to Earth.

The side boosters landed, touching down at LZ-1 and LZ-2 at Kennedy Air Force Station, the designated landing pads SpaceX uses to recover its reusable rockets. But the core, middle booster, which attempted to land aboard “Of Course I Still Love You,” a drone barge that SpaceX uses as a mobile, ocean-borne landing bad stationed in the Atlantic for its flights departing from Florida, wasn’t recovered.