Sneak Peek of the In-Progress Condos at 400 Park Ave. South

Christian de Portzamparc's 400 Park Avenue South, aka the Fortress of Glassitude, is one of those buildings that feels like it's been in the works for forever—the original building permit was filed nearly a decade ago—but there is finally a light at the end of the construction tunnel. The rental portion is now leasing, and condo sales launched in late September. The building won't welcome its first residents until fall 2015, but Curbed recently got a sneak peek at the in-progress condos, including the full-floor 4,050-square-foot 40th floor penthouse, which will list for around $20 million.

Developer Toll Brothers, in partnership with Equity Residential, bought the site with plans in place in 2011, and they put the first shovels in the ground in 2012. The lower levels of the 40-story tower hold 269 rentals (developed by Equity), while the top 18 floors hold 81 condos (developed by Toll), ranging from studios to four-bedrooms. The tenants and residents share a pool, gym, lounge, and sauna in the basement, while the condo owners also get a separate "sky lounge" terrace on the 27th floor.

[Stephen Alton on the interior design of 400 Park Avenue South.]

While the condos themselves are still very much a construction site, interested buyers can see the finishes at the project's sales gallery across the street, where a full kitchen, master bathroom, secondary bathroom, and powder room are built out. Stephen Alton designed the interiors, and he drew inspiration from Portzamparc's angular facade by incorporating geodesic shapes in the kitchen island and bathroom cabinets.

And now, take those finishes and imagine them in these glassy, under-construction homes:

· 400 Park Avenue South [official]
· 400 Park Avenue South Reveals Interiors, Lots of Floorplans [Curbed]