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Clark County has ordered MGM Mirage to verify that CityCenter’s towers are structurally sound.

The order, in a letter Monday from Development Services Director Ron Lynn to MGM Mirage Vice President Bill Ham, came six months after significant structural defects were found at the Harmon, one of seven buildings simultaneously rising at the company’s $9 billion project.

After the engineer of record on the project raised concerns, the county determined that 15 floors of reinforcing steel at the Harmon had been improperly installed by subcontractor Pacific Coast Steel, which is overseen by CityCenter general contractor Perini Building Co.

The problems were repeatedly missed by third-party private inspector Converse Consultants, hired by MGM Mirage to ensure the complicated