Our crack team has done some digging on Curbed's building du jour, Lower East Side development 7 Essex Street. Reports our spy, "One of the nice features of the property is that most of the apartments have multiple exposures. However, according to the condo docs, any of the side windows face the chance of being walled up at the owner's expense in the event of future development on the adjacent lots. (Note: This may be a standard clause, but it wasn't in any condo or co-op docs that I've read to date.)"
Here's the exact language: "Owners of units with side wall windows facing adjacent properties which could be developed in the future, shall be solely responsible for the sealing of effected windows in the event future development should occur and for the cost of sealing such windows." Hmmm.