It was a dark and stormy night — but not steamy.

Along with city and state agencies working on complex transportation issues, building owners are assessing damage to the infrastructure of their properties, from the tippy-topped bent crane at One57 to the flooded subcellar levels at 1 World Trade Center.

The saltwater puddles and flotsam left by the receding flood waters have also wreaked havoc on construction sites and underground vaults containing phone and other cables.

The explosion at the Con Ed facility on East 14th Street turned off both electricity and steam lines for customers, generally south of 42nd Street for steam and 39th Street for power.

There are 1,800 steam customers — that is, buildings — in Manhattan, and while two other steam plants continued to operate, it was unclear if steam could be rerouted.

Along with homes not having power, nearly every office building in the southeastern part of Manhattan was powerless, as steam runs both chillers for heat and cooling as well as electricity.

That said, all Malkin Properties’ buildings both uptown and on the West Side, around Times Square South and Herald Square, including the Empire State Building, were up and running.

“All buildings have power and steam. No failures. No issues,” Anthony Malkin, the company’s president, said in an e-mail.

The Observatory was shut down two hours before the MTA stopped bus and subways to allow folks time to get home, and he expects the Observatory to be open as soon as possible.

Con Ed believes it will take four to 10 days to get electrical power back for hundreds of thousands of customers.

Among those still lit was Google’s 111 Eighth Ave., which has extensive backup generation capacity, according to Charles Bendit of Taconic Partners, which once owned but still manages that full-block behemoth.

Penn South, the 10-building residential complex in Chelsea, also has power as the Mitchell Lama co-op has its own power plant.

The bent-over dangling crane on top of Extell Development’s One57 led to West 57th Street being cordoned off for fear the entire structure would fly off in the windstorm. Among others, this closed: Carnegie Hall Tower, Metropolitan Tower, the Parker Meridian hotel and even Vornado Realty Trust’s own offices at 888 Seventh Ave. The police have a temporary command post at 250 W. 57th St. to monitor the crane.

Gov. Andrew Cuomo was among those who descended seven stories into the base of 1 World Trade Center only to find water at the bottom. He said it was unclear if the water was coming in from the bottom — which would mean the “bathtub” keeping out the Hudson River had been breached — or if the water was merely from the rain.

Since the buildings of the complex are attached underground, there appeared to be water on the lower levels over the entire 16-acre site, and a lot of water was observed at the vehicle-security center nearest West Street.

Silverstein Properties, which owns 7 World Trade Center and is completing 4 World Trade Center while finishing the bases of 2 and 3, said nothing was damaged, though there was some water in lower levels. Seven WTC was running on “fully functioning” emergency power.

The Memorial drained its water harvest tanks and stopped the two pools prior to the arrival of the storm, and some water was observed in the still uncompleted Museum area.

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In a significant relocation, the artist agency CAA will be moving from 162 Fifth Ave. in the Flatiron District to the Chrysler Building by Grand Central.

The agency has leased 74,550 square feet, encompassing the entire 18th through 20th floors of the Art Deco icon at 405 Lexington Ave. at East 42nd Street.

CAA was represented by Neal Golden, Ross Perlman and Lee Brodsky of Newmark Grubb Knight Frank ,while Tishman Speyer Properties was repped in-house.

Asking rents were unavailable but were in the mid-$60s for lower floors earlier this year. It is possible that this deal went into the $70s per square foot and included expansion rights.

The agency represents A-list stars including George Clooney, Will Smith and Oprah Winfrey.

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The Hilton Hotel has renewed a lease for its 70,000 square feet of expo space that is seemlessly integrated into the base of the adjacent mid-block office building at 1325 Ave. of the Americas.

Michael Goldman of Studley represented Hilton in the long-term deal.

Paramount Group owns the office tower and was represented by a CBRE team.

Sources said the asking rent was in the mid-$60s a square foot, consistent with Class A area rents.