JPMorgan’s Former ‘Punch Card’ Building Unveils $10,000 Rentals

The nation’s biggest office-to-residential conversion is hitting the market with 1,300 apartments carved from a million-square-foot brick fortress originally built to house computers — and not much else.

After a two-year transformation, the 55-year-old building in Manhattan’s financial district — used for years to process checks, money transfers and other paperwork for Manufacturers Hanover Trust and then later, for back-office staff at its successor bank, JPMorgan Chase & Co. — is now unrecognizable.