<Tr> <Th_colspan="2"> References </Th> </Tr> <P> 301 Mission Street is a development in the South of Market district of downtown San Francisco . A mixed - use, primarily residential development, it is the tallest residential building in San Francisco . The blue - gray glass, late - modernist buildings are bounded by Mission, Fremont, and Beale Streets, and the north end of the Transbay Transit Center site . Opened to residents on April 23, 2009, 301 Mission includes two buildings: a 12 - story tower located on the northeast of the property, and Millennium Tower, a 58 - story, 645 - foot - tall (197 m) condominium skyscraper . In total, the project has 419 residential units, with 53 of those units in the smaller tower . The tower's highest level, 58 floors above the ground, is listed as the 60th, because floors 13 and 44 are missing for superstitious reasons . The French restaurant and wine bar International Smoke is housed on the ground floor of the skyscraper . Resident services include a private concierge and access to the 20,000 - square - foot (1,900 m) Owner's Club Level, which features amenities such as a private lounge, wine cellar, and fitness center . The development's "lifestyle" program organizes cultural events . In May 2016, residents were informed the main tower was both sinking and tilting, resulting in several lawsuits concerning repair costs and whether the tilt had been withheld from buyers . </P> <P> Developed by Mission Street Development LLC, an affiliate of Millennium Partners, the US $350 million project was designed by Handel Architects, engineered by DeSimone Consulting Engineers and constructed by Webcor Builders . At 645 feet (197 m), it is the tallest concrete structure in San Francisco, the fourth tallest building in San Francisco overall, and the tallest since 345 California Street in 1986 . It was also the tallest residential building west of the Mississippi River when finished (later surpassed by The Austonian in Texas). The tower is slender, with each floor containing 14,000 square feet (1,300 m) of floor space . In addition to the 58 - story tower, there is a 125 - foot (38 m), 11 - story tower on the northeast end of the complex . Between the two towers is a 43 - foot (13 m), two - story glass atrium . In total, the project has 419 units . </P> <P> The residences are pricey; a penthouse unit sold for US $13 million in December 2016 . The bottom 25 floors of the main tower are called Residences while the floors from 26 to the top have the name Grand Residences . (As is common in many high - rises, there is no thirteenth floor because of superstitions about triskaidekaphobia . Neither is there a forty - fourth floor, because the number four is considered unlucky by many Asians .) The 53 units in the separate 12 - story tower are called the City Residences . Below street level, there are 434 parking spaces in a five - level subterranean garage located under the 11 - story tower . The building is located next to the site of the future Transbay Transit Center . Overall, the tower's design is intended to resemble a translucent crystal, and is a landmark for the Transbay Redevelopment and the southern skyline of San Francisco . </P>

Who built the millennium tower in san francisco