The current plans for the Second Avenue Subway, made in the 2000s, will not use this space; the new Houston Street station will instead be built below the existing one, with a free transfer between them. The decision to use a deeper alignment under Chrystie Street was made to simplify construction and lessen impact to the community. Second Avenue service will be tentatively provided by the T train once Phase 3 of construction is complete. When this happens, the station will become a terminal station for southbound service. There will be a double crossover north of the station. However, Phase 4 of construction will extend the line south, below Houston Street, in the direction of Hanover Square.