An action to foreclose a mortgage is governed by a six-year statute of limitations, pursuant to CPLR 213[4]. Even if a mortgage is payable in installments, once a mortgage debt is accelerated, the entire amount is due and the statute of limitations begins to run on the entire debt.
Anglestone Real Estate Venture Partners Corp. v. Bank of N.Y. Mellon, NY Slip Op 06109 (2d Dep't November 29, 2023)
