A few cadets started sneaking down to the boiler room to play cards, you know, exchange ideas.
The Boiler Room is the misnomer given to the SHIELD Academy entertainment room and bar. FitzSimmons shows the rest of the team this SHIELD-branded club, which, according to Agents of SHIELD Season One Declassified, was a carefully crafted set “built in downtown Los Angeles.” Agents of SHIELD Season Three Declassified reveals that the Reserve, in the Bank of America building on Spring Street, was used.
MAP
(Agents of SHIELD S01E12, 2014)
MCU: Location Scout 