Host Geoffrey Mazel talks with Ben Williams, a member of Rosenberg & Estis, P.C. and leader of the firm’s property tax department, about the new J-51 legislation. It became law on October 24, 2026, and opens an important opportunity for eligible co-ops and condos doing capital improvements. The new program takes effect January 1, 2027. Buildings that finished eligible work between June 30, 2026 and January 1, 2027 will have four months, until May 1, to file. Williams compares this with the rollout of the 2024 J-51 Reform Program, when applicants had only weeks after HPD published its rules. He also explains why J-51 has to pass both Albany and the City Council, and how HPD and the Department of Finance split the work. On eligibility, Williams says most buildings don’t know they qualify, and many that know about the program wrongly assume they don’t. The assessed value cap is now $60,000 per apartment, indexed to inflation, which could add roughly 1,000 eligible buildings. Eligibility is measured in the fiscal year the work starts, not when it ends. Williams, a former engineer, explains why pre-commencement requirements and the $1,500-per-apartment minimum make planning ahead essential, even with a 10-year runway through June 30, 2036. The conversation covers which projects qualify under HPD’s certified reasonable cost schedule: low-E double-glazed windows, right-sized boilers and burners, heat pumps, insulated roofs, Local Law 11 facade work and gearless elevators. Solar panels fall under a separate abatement. Williams also explains how the credit works. Buildings can now recover 100% of certified reasonable costs, up from 70%, at up to 8⅓% a year over 12 years. The abatement can’t exceed half the tax bill or touch the land portion, and unused credit can carry forward for up to 20 years.