The Second Avenue Subway Phase 3, the planned extension of the line south from 72nd Street to Houston Street on Manhattan’s East Side, has no funding, no engineering work underway, no environmental review, and no construction timeline. It remains part of the MTA’s long-range vision for a full-length East Side trunk line, but recent decisions by New York’s governor have redirected near-term attention and dollars toward a different extension across 125th Street in Harlem, leaving the downtown route further from reality than it has been in years.
What Phase 3 Would Build
Phase 3 is the third stage of a four-phase plan to run a new subway line the length of Manhattan’s East Side, from 125th Street down to Hanover Square in the Financial District. Phase 1 opened on January 1, 2017, adding stations at 72nd, 86th, and 96th Streets at a final cost of roughly $4.5 billion. Phase 2 extends the line north from 96th Street to 125th Street and is targeted to open in 2032. Phase 3 would pick up at the Phase 1 terminus at 72nd Street and run south to Houston Street on the Lower East Side. Phase 4 would then carry the line the rest of the way to Hanover Square.
Once the full corridor is built, service is planned to run as a new “T” train covering the entire route, giving the East Side a second north-south trunk line and relieving the chronically overcrowded Lexington Avenue 4/5/6 lines.
The MTA has estimated the combined cost of Phases 3 and 4 at $13.5 billion. That figure covers both the downtown extension to Houston Street and the final push into Lower Manhattan; the MTA has not published a separate Phase 3 cost estimate, station locations, or alignment details beyond the broad route.
Current Status: Nothing Funded, Nothing Designed
Phase 3 has not entered engineering. It has not entered environmental review. It is not in the MTA’s capital program, and no federal funding commitment exists for any phase beyond Phase 2. To move forward, the project would need formal environmental scoping, inclusion in a future MTA capital program, and a dedicated construction funding package drawn from federal and state sources. None of that is in motion.
The locally preferred alignment selected in 2001 and the 2004 federal Record of Decision cover the full four-phase corridor, so the underlying planning framework exists. But that framework is more than two decades old, and advancing Phase 3 to construction would require fresh engineering, updated environmental work, and billions of dollars that are not currently budgeted or promised.
Why Phase 3 Got Pushed Back
Instead of advancing Phase 3 next, Governor Kathy Hochul announced funding in her January 2026 State of the State address for design and engineering of a different extension: a westward crosstown route along 125th Street, taking the Q train from the Phase 2 terminus at Lexington Avenue to Broadway. The New York Post reported that the move effectively shelved the downtown plan in favor of the Harlem route.
The 125th Street extension would add three stations, at Lenox Avenue, St. Nicholas Avenue, and Broadway, connecting the Q train to seven existing subway lines. The MTA projects it would serve roughly 240,000 daily riders across the system and reduce regional car travel by 26,000 vehicle miles per day. A December 2025 feasibility study placed its planning-level cost at between $5 billion and $7 billion. The FY27 state budget secured $25 million for preliminary engineering, design, and environmental review.
Two practical factors explain the sequencing. First, the tunnel-boring machines being brought in for Phase 2 could be reused on the 125th Street extension without disassembly, saving time and money. Hochul said the work could proceed “seamlessly using much of the same equipment from phase 2.” Phase 3’s downtown route begins at 72nd Street, far from the Phase 2 work zone, and offers no equivalent construction synergy. Second, the feasibility study warned that the window to integrate the 125th Street extension with Phase 2 is closing: current decisions about the Phase 2 terminal’s geometry and staging areas will determine whether a westward extension stays feasible without expensive rework. That timing pressure does not exist for Phase 3.
The Funding Picture
Phase 2 itself shows how hard the money is to assemble. The $6.968 billion project leans on $3.4 billion in federal Capital Investment Grant funding, awarded in November 2023, plus congestion pricing revenue flowing to the MTA’s capital program. When Hochul briefly paused congestion pricing in June 2024, the MTA halted advertisements for most new construction contracts; a Phase 2 procurement notice had explicitly stated that contract awards were “subject to funding availability, which requires the implementation of congestion pricing.”
Federal commitments have also faced political review. Jamie Torres-Springer, president of MTA Construction and Development, said in late 2025 that Phase 2 was subject to an “administrative review related to some policy changes” by the federal government, though he expressed confidence the $3.4 billion commitment would hold, noting that mass transit funding had been sustained in the president’s proposed budget and in both houses of Congress.
For Phase 3, the implications are blunt. There is no federal funding commitment. There is no slot in the current capital program. And the $13.5 billion price tag for Phases 3 and 4 together would require a funding package on a scale that does not appear in any current planning document.
Realistic Outlook
The project’s own history sets expectations. A Second Avenue subway was recommended in the Regional Plan Association’s first regional plan nearly a century ago. Mayor John Lindsay held a groundbreaking at 103rd Street in 1972, about a mile of tunnel was dug, and the city’s fiscal crisis shut the work down in 1975. Phase 1 took more than a decade to build after the modern plan was adopted. Phase 2 did not reach major construction until nearly a decade after Phase 1 opened, with a groundbreaking ceremony on June 9, 2026, and revenue service not expected until 2032.
Against that record, Phase 3 is likely decades from reality. Completing environmental review, winning a place in a future capital program, assembling billions in state and federal funding, and sustaining political commitment across multiple administrations are all prerequisites, and none of them is currently in progress. For residents of the Lower East Side and Lower Manhattan hoping for direct Second Avenue service, the near-term answer is that the line is not coming anytime soon, and the next piece of Second Avenue Subway construction after Phase 2 is more likely to run west under 125th Street than south toward Houston.