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DENVER — The X Company wants to up its count in Denver.

Last month, the city received an early-stage development proposal calling for the construction of X Denver 4 — an 18-story, 409-unit apartment building — at 2000 Welton St.

The moniker indicates the project is the latest in the works locally from Chicago-based X, which is already constructing X Denver 1 and X Denver 2 on adjacent sites in Union Station North, and has proposed the 21-story X Denver 3 project in the 2100 block of Arapahoe Street.

All of the projects are apartment complexes.

The X Social Communities was previously part of the development portfolio of New York-based Property Markets Group, now PMG. In 2019, however, it was spun off into a separate company, according to the Phoenix Business Journal. PMG remains a joint venture partner in some X projects.