The Suffolk County Police Benevolent Association has moved into new headquarters in Brentwood, which it bought for just under $4.5 million earlier this year, according to public land records.

Emblazoned with large blue “Suffolk County P.B.A.” signs visible from the Long Island Expressway near Exit 53, the 28,200-square-foot office building sits on 2.7 acres.

Public records show the union bought the building from 500 Expressway Drive South LLC on April 21 for $4.475 million. The Suffolk PBA has a $3 million mortgage with Bethpage Federal Credit Union on the building.

Suffolk PBA president Noel DiGerolamo said the more than 1,500-member union purchased the building as an investment and occupies less than 10,000 square feet of the structure. Seventy percent of the office space is leased, he said.

Critics have said the county gave the PBA too generous of a contract in 2012 while the county faced ongoing deficits, laying off workers and borrowing against its buildings for cash.

“At the same time we had to sell the H. Lee Dennison building, the town hall of Suffolk County, [the union had] such a big contract they moved into the Taj Mahal of union halls,” said Legis. Robert Trotta (R-Fort Solanga), who has been critical of the union.

The Suffolk PBA had almost $11 million in assets in 2014, according to the latest IRS tax forms available. The union had $4.36 million in revenue and $4.2 million in expenses that year. That’s in addition to the union-controlled super PAC, the Long Island Law Enforcement Foundation, which collects $900,000 a year from law enforcement members to spend on campaigns.

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The Suffolk PBA is still listed as the owner of its old headquarters in Bohemia on Church Street.

Among the tenants in the new building, according to a leasing website, is the workers’ compensation law firm Pasternack Tilker Ziegler Walsh Stanton & Romano LLP and attorney Robert L. Spadaccini.