The building used to be a dock for ships. However, it had been ages since it had been used for that purpose, so these days it was just another abandoned building. The only things reminding anyone of its past function would be the many empty shipping containers that had been left behind.
Those were one of the reasons why the Grey colour gang had chosen to use it as their base. Many of their members were runaways, homeless, or just had nothing else to do, so they used the shipping containers as their sleeping quarters. They were filled with quilts, sheets, and small cooking units here and there.
Not only could these containers be found inside the warehouse, but outside as well. In their ones though they were filled with the more high ranking members of the Grey colour gang. The better equipped ones were reserved for those with more say. The most 'luxurious one', the one at the very back, had a steel door so the gang leader could enjoy his privacy.