Figures computed from the FY2026–27 DOF assessment roll. Surcharge estimated at the flat Phase-1 rates (4% $1–3M, 5.25% $3–5M, 6.5% over $5M) on each unit's full DOF market value; applies to non-primary residences only.
The quantitative picture
DOF market values at Two Waterline Square run from about $544,194 at the low end to $3,510,229 at the top, with a median of $1,025,506 — meaning the typical unit already clears the $1M threshold. A median unit that isn't a primary residence owes roughly $41,020 a year (4% of its full DOF value); the building's most valuable residence owes about $184,287 a year at the 5.25% rate. Across the 88 exposed units, the surcharge totals an estimated $4.7 million annually — an average of about $53,863 per exposed unit.
Of those 88 exposed units, 86 carry DOF values between $1M and $3M (the 4% band), 2 between $3M and $5M (5.25%), and 0 above $5M (6.5%) — most exposed units sit in the 4% band, just over the line — a $1.5M DOF value owes $60,000 a year, not a rounding error. DOF files the building as 400 West 61st Street, which is where owners will find their unit on the roll.
The last three closed sales
From ACRIS, the building's three most recent recorded deeds over $1 million:
| Date | Residence | Recorded price |
|---|---|---|
| Jul 13, 2026 | 33D | $3,900,000 |
| Apr 15, 2026 | 28C | $3,500,000 |
| Mar 20, 2026 | 29D | $2,400,000 |
Note the gap between these prices and the tax base: the surcharge is charged on the DOF market value — an income-derived figure that runs far below open-market numbers — not on what a unit trades for. A residence that closes at $3.9M does not owe 5.25% of $3.9M; it owes the flat rate on its (much lower) DOF market value. That distinction is the single most misunderstood part of the tax, and the reason a free DOF-value lookup is worth more than any sale-price estimate.
The building
Two Waterline Square at 30 Riverside Boulevard was completed in 2019. It was designed by Kohn Pedersen Fox Associates and developed by GID Development Group; it is the largest of the Waterline Square towers and has a twin-peaked form with a cascading facade and angling crowns.
Where it is
30 Riverside Boulevard, Upper West Side.
Is your Two Waterline Square unit exposed?
The free review pulls your unit's official DOF market value, runs the exact surcharge, and shows what a 12-month lease or a sale would change — usually within the hour.
Check My Unit — FreeDisclaimer & method. Educational information from Conquest, a licensed New York real estate brokerage — not legal, tax, or accounting advice. Building figures are computed from the FY2026–27 DOF assessment roll at the statutory flat Phase-1 rates (4% $1–3M, 5.25% $3–5M, 6.5% over $5M) on each unit's full DOF market value, and represent exposure if every over-threshold unit were a non-primary residence; actual liability depends on each owner's occupancy and exemptions. Sale prices are recorded deeds from ACRIS.