Mayor Zohran Mamdani last week revived plans for the long-stalled development of Sunnyside Yards, prompting a mixed response to a project that once invited sharp public criticism.

Mamdani made the surprise announcement on Feb. 27, less than 24 hours after making an unannounced trip to Washington to meet President Donald Trump, where he proposed a partnership with the Trump Administration on a roughly $21 billion plan to deck over the railyard and build 12,000 new homes — half of them under the Mitchell-Lama program — alongside parks, child care center and other infrastructure.