New York City property tax system faces fresh scrutiny after mayor proposes pied-à-terre levy

New York City’s property tax system is facing renewed scrutiny asourceser Mayor Zohran Mamdani proposed a pied-à-terre tax targeting luxury second homes.

Mamdani has pointed to billionaire Ken Griffin’s $238 million penthouse as an example of how city assessments can diverge sharply from market values. The property is assessed at $9.4 million for tax purposes.

Proposed pied-à-terre tax

The proposal, announced May 7, 2026, would apply to an estimated 11,200 second homes valued over $5 million.

Supporters say the levy could raise about $500 million a year and encourage some owners to use properties as primary residences. Critics argue it could deter investment in the city.

Griffin has said Citadel plans to expand in Miami over New York City in response to the proposal.

Broader concerns with assessments

Tax policy experts say the debate also highlights structural issues in the city’s property tax framework.

Jared Walczak of the Tax Foundation said a pied-à-terre tax may be politically popular but does not address the underlying design of the system. Under current rules, luxury condos are assessed based on hypothetical rental income rather than sales prices, which can produce comparatively low taxable values.

The system has also been criticized for burdening renters and for imposing higher effective tax rates on large apartment buildings than on single-family homes—dynamics that can add to housing affordability pressures. Progressive city leaders have sought broader reforms for decades without success.