Here's the explaination from Ernst Wagner, the building's owner, who is completing the work:
When Paul Rudolph designed 246 in the early 90's, the zoning of that time allowed a 9-story structure, and a building permit was issued. In 1994 the area was downzoned and now, 20 years after - the original 4-story structure will be increased by two additional sistered duplexes in the Rudolph DNA. Likewise, the facade will continue upwards in Rudolph's language, topped by a roof garden. Mark Squeo, the job captain under Rudolph in the 1990's will oversee the addition, this time in the capacity as the architect of record.
The images above show some of Mr. Rudolph's unbuilt facade studies. More history of the MODULIGHTOR Building is available on the Paul Rudolph Foundation website under "about us," or come visit for yourself!
Our next open house is Friday, June 1st, 2012. Tickets will be available two weeks ahead of time.