SAN FRANCISCO — San Francisco officials are looking for answers as to why the city’s building inspection department waited years to look into evidence of structural issues involving a luxury high-rise that is sinking more than expected.

The San Francisco Chronicle reports ( ) the occupied 58-story Millennium Tower has sunk 16 inches since its completion in 2009. Engineers had predicted it would sink just 4 to 6 inches over its lifetime. The newspaper reports the building has also tilted 2 inches.

Building inspection officials told the San Francisco Board of Supervisors on Thursday that they didn’t launch an inquiry until a person living near the building called the city last month. That’s despite a 2009 letter in which a former official questioned the rate the building was settling.

This story has been corrected to show the year the Millennium Tower was completed was 2009, not 2010.

Information from: San Francisco Chronicle,

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