An image of the façade has been in circulation since early this year, but last week the planners revealed renderings of how some interior spaces might look and how the center’s many amenities — including a restaurant, theater, day care center, gym and pool — might be stacked in a building of up to 15 stories.

There would also be a 9/11 memorial and a space open to people of “all faiths and of no faith” for prayer, contemplation and meditation, Mr. Gamal said.

The space for Muslims would be in the basement. Technically, it would be a prayer hall known as a musalla, because its construction would not meet rules required to sanctify a mosque.