I imagine civil defense is also very much a signifigantly larger issue in NYC then it was OTL. There's the real risk that NYC might end up being bombed from the air or shelled from at sea. So their might be a trend towards more durable building types. By the SGW probably has something like mandatory bomb shelters in all new buildings, bomb shelters in public buildings, and a public shelter every so many blocks. I wouldn't be surprised if the NYC Subway wasn't partially intended to act as public bomb shelters from the start. Similarly coastal defense and AAA defense are both much more important then OTL with a signifigant military presence in and around NYC. There's probaby mandatory bomb drills in public schools.
Similarly I imagine there's some sort of militia/ home guard type force during war time composed of those in reserved occupations, older veterans, and those too young to enlist/be drafted or supplement coastal defenses, civil defense, public security, and manning AA batteries/ searchlights. I wouldn't be surprised if Governors island is more or less still one big military base. Hell on OTL Liberty Island we know there's a TL "Statue of Remembrance". I'd say there's pretty good odds there are still active coastal artillery batteries up to the SGW. So a much more militarized and fortified city then OTL. Perhaps more "Brutalist" then OTL as there's a push to build lots of concrete replacement buildings to make up for SGW damage and provide extra social housing. In OTL in the late 1800's there was a trend in NYC and elsewhere in the US to build lots of NG armories that were essentially stylized bunkers. That's probably even more true in TL.