Santiago Calatrava's plan for a Tower o' Penthouses took forever to die at 80 South Street, but eventually it was replaced by plans for a 720-foot tower with a skin made of photovoltaic glass. The proposal also calls for cascading gardens running through the facade.

Some new renderings for this long-thought-lost project resurfaced at the end of 2011. Developer Time Equities has never pushed the project any further than the "pre-development" phase, alas.

Developer Larry Silverstein announced plans to break ground on this project, a Robert A.M. Stern-designed Four Seasons/condo building, this year. Nothing yet, but there are almost three months to go in 2012.

The Rem Koolhaas-designed sibling to One Madison Park got the axe during the economic meltdown (which meant a sad farewell to its utterly wacky sales office, too). But when One Madison Park's receiver asked for permission to bring architect Cary Tamarkin on board to help finish the project, there was a hint that he might help to figure out the future of the Koolhaas lot, too. Dare we hope that the starchitect's avant-garde design might return? It and 56 Leonard are frenemies, after all.

There are no plans afoot to finish this building, so it will probably retain a permanent place on our wishlist. It stands at 29 stories, but the original plan was for 100. The Skyscraperpage forum has some renderings.

This project is one we'd like to see resume not so much for the widely-criticized building itself but for the battle it sparked over the NYC skyline. Vornado Realty Trust's plans for 15 Penn would offer a challenge to the Empire State Building just two blocks away, and perhaps even block views of the ESB from the west. Right now Vornado's focusing on its short-term plan, a renovation of the Hotel Pennsylvania.

Developer Hines filed plans last summer for a shortened version of Jean Nouvel's tower. It will, if it moves forward—fingers crossed—clock in at 78 stories, with 100 hotel rooms and 480,000 square feet of residential space. The design received some tweaks, too. Here's the most recent archibabble: "The facade consists of several sloped planes at different angles, which ascend to a sharp needles at the top of the building. The tower top is distinguished by three distinct asymetrical peaks, of varying height and shape."

The Upper East Side's The Charles remains an empty lot more than two years after its originally scheduled completion date of spring 2010. But the building announced in late 2011 that it was back on track. Developer Victor Homes was allegedly coming on board to "prepare and position the property for construction within the next 12 months"—a deadline that's fast approaching. The original plan was for 45 units designed by David Collins, with the building done by Ismael Leyva.