Passage: the project officially began construction 1 August 2014 when the National Science Foundation (NSF) authorized the FY2014 portion ($27.5 million) of its construction budget. The ceremonial laying of the first stone was performed on 14 April 2015. Site construction began on April 14, 2015, with first light anticipated in 2020, and full operations for a ten-year survey commencing in January 2022.LSST, unlike almost all previous large astronomical observatories, has committed to making all data public as soon as it is taken.  In their words "By providing immediate public access to all the data it obtains, it will provide everyone, the professional and the “just curious” alike, a deep and frequent window on the entire sky."

Question: How many millions of dollars was the construction budget for the project?
27.5