I've spent enough time in Williamsburg to know there's a lot more to the story--and there is. As with more than a few luxury lofts, 573 Metropolitan Avenue housed humble manufacturing businesses, and for at least some of the time could have been called a sweatshop.
The first reference to that address I could find, in the 1914 Brooklyn Daily Eagle, identified the location as a factory. But that had to be a predecessor building, since StreetEasy dates the building to 1920, a time of the area's growth, just 17 years after the Williamsburg Bridge started pouring people into the neighborhood from the Lower East Side and four years before the subway (now the L train) opened up nearby at Lorimer Street. (The G train stop didn't come until 1937.)
Perusing the Daily Eagle, I saw a 1937 advertisement for canvassers to sell floor lamps, a 1940 business opportunity to buy a 5,000 square foot garment factory (one floor?), a 1948 ad seeking operators for ladies coats, and a 1950 ad seeking operators for Jo-Ann Sportswear.
In 1942, according to the Daily Eagle, the Metropolitan Cloak Company at that location was enjoined by the court for wage and hour violations. In 1957, labor racketeering charges were filed involving a bogus garment workers union and the Vogue Knitwear company, according to the New York Times.
As of 1982, the D&L Dress Co. still operated at 573 Metropolitan. Fast forward to 2001, where when a New York Post article explained how "18 members of the The Mexican Boys gang were arrested last night on weapons and unlawful-assembly charges after a raid in Brooklyn" at a laundromat at 573 Metropolitan Avenue. (I suspect that's adjacent.)
Then came the "art center and studio/co-working space 3rd Ward," as described by Hyperallergic's Mostafa Hedday, which leased 573 Metropolitan in 2005, and saw it shut down on Oct. 15, 2010 for code violations, three years before 3rd Ward itself crashed and burned.
Free Williamsburg described the shutdown, quoting a former tenant and employee of 3rd Ward as describing it as a "converted sweatshop" that had not been properly and safely converted. (The then-owner of the building, who has sold it to an LLC he may--or may not--control, also came in for criticism.)
Last June, the Times announced an 18-month lease, at $24/square foot, for State Senator Martin M. Dilan "for 2,000 square feet on the lower level of this six-story building, which was gut renovated in 2011." And this area around the second L stop in Williamsburg is the site of a new wave of development.