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A “lot line window” is a window that is built on a side of a building that shares a boundary line with a neighboring property. If the adjacent building is built up to or higher than this window, then the lot line window will likely need to be sealed off. For example, Unit 8A has a living room window that faces North. The adjoining property owner on the North builds a 10 story building blocking the windows of Unit 8A. Lot line windows will not affect an owner as an apartment dweller unless your neighbors build up to the level of your apartment or higher. The concern for a purchaser is that a lot line window that is never disclosed and years later an adjoining building is constructed resulting in the window being permanently closed. In the event such obstruction occurs, the owner would be required to close up the window (usually at the owner’s own trouble and expense), losing both natural light and view.