Land where there was none before. A careful ratio of places to live, work, eat and recline on lawns. A sense of being in New York, but not quite of it.

At first blush, Hudson Yards and Battery Park City, cities-within-a-city on the western edge of Manhattan, would seem kindred spirits.

But Hudson Yards, which is to wrap up by 2026, will have taken 18 years to complete its gleaming clump along 10th Avenue — and it remains to be seen how quickly the rest of the neighborhood will develop. Battery Park City, which lumbered across the finish line in 2011, took 45 years to fully form.

Battery Park City stretches across more space along the Hudson River in the financial district, but a similar number of buildings make up the two master-planned, mixed-use communities, which have both also enjoyed tax breaks and other public benefits.