The Harvester Hideout is a small, secluded, repurposed parking garage in Deus Ex: Human Revolution. It has multiple levels with several methods of entry, most of which are heavily guarded, and ~20 more guards within.
Despite it being in the Youzhao District, and on the map, during the players first trip to Hengsha, it is largely inaccessible - even it's sewer system is deserted, aside from a few bottles of spirits. During the second visit, however, the compound is very populated and on alert. It is used as the headquarters by the Harvesters, a very influential street gang that prosper through 'harvesting' mechanical augmentations from other people or salvaged from cadavers.