WeWork — remember them? — just signed a lease for 37,000 square feet at 511 Fifth Ave. between East 42nd and 43rd streets. It adds to WeWork’s growing, 3.3 million-square-foot portfolio of Big Apple coworking spaces — part of a global portfolio of 45 million square feet. But if you didn’t know the company had such a big footprint since its meltdown and subsequent 2023 bankruptcy , you aren’t alone. WeWork emerged as a responsible, if stealthy space-consumer that operated mostly under the media