10 Madison Square West Entry
10 Madison Square West Exterior
10 Madison Square West Lobby
10 Madison Square West Pool
10 Madison Square West_Living room
10 Madison Square West Entry
10 Madison Square West Exterior
10 Madison Square West Lobby
10 Madison Square West Pool
10 Madison Square West_Living room
Undivided Assessment · Flatiron District · Value Index: A (91/100)
10 Madison Square West: One of Flatiron's most strategically sound luxury condo addresses
Overview

10 Madison Square West earns its position among Flatiron's most compelling investment-grade residences on four dimensions:

  • A conversion building with genuine scarcity: 125 residences in a landmarked 1915 Beaux-Arts structure that cannot be replicated.

  • Oversized layouts, rare in the Flatiron condo market, that support both primary living and strong resale liquidity.

  • Interiors by Alan Wanzenberg, whose restraint and material quality age exceptionally well and hold buyer appeal across market cycles.

  • Direct Madison Square Park frontage, one of Manhattan's most enduringly desirable residential positions.

KEY BUILDING FACTS
Year Built
1915 (converted 2014)
Number of Units
125
Developer
Witkoff & New Valley LLC
Architect
Alan Wanzenberg (interiors), Goldstein Hill & West (conversion)
Management Company
Douglas Elliman Property Management
Front Desk Number
TBD
FINANCIAL SUMMARY
Monthly Common Charges / HOA
Varies by unit (~$2,500-$12,000)
Monthly Taxes
Varies by unit (~$2,000-$10,000)
Special Assessments
None publicly listed
Tax Abatement
None publicly listed
Undivided's Assessment

10 Madison Square West is among the few Flatiron condos that satisfy both halves of the investment equation: a building of genuine architectural character and a balance sheet that holds up under scrutiny. The 1915 Beaux-Arts conversion offers the irreplaceable fabric of pre-war construction, high ceilings, deep setbacks, and thick walls, within a fully modernized residential plant. The common charges are competitive for a building of this amenity depth, which reflects a well-run HOA. No structural or systems issues have surfaced in over a decade of residential use.

For buyers evaluating Flatiron condos with an investment lens, this building consistently clears the bar: competitive price per square foot, proven resale demand, and a location directly fronting Madison Square Park that continues to attract a deep and diverse buyer pool. One honest note: the new development premium from the 2014 to 2015 launch has normalized. Trophy units on high floors with direct park frontage continue to command strong pricing and rental returns. Mid-tier floors are more likely to track neighborhood averages going forward. Buy the right unit and the thesis holds.

Undivided Value Index™ Score
OVERALL SCORE:
View our full methodology
10 Madison Square West
A (91/100)
Character Profile
Investment-grade Beaux-Arts conversion with a sophisticated, design-conscious resident community.
SCORE BREAKDOWN BY CRITERION:
Location Power
20%
[95/100]
Steps from Madison Square Park, world-class restaurants and multiple subway lines
Amenity ROI
15%
[91/100]
10,000 sf residents club with 60-ft lap pool, full spa, yoga studio, and fitness center managed by The Wright Fit. One of the few buildings where residents actually use what they pay for, and the common charges justify it.
Financial Fundamentals
20%
[82/100]
Common charges are competitive and well-managed for this quality tier. Taxes are in line with the neighborhood. The new development premium from 2014 to 2015 has normalized. Prices remain strong but buyers should expect stabilization toward neighborhood averages rather than outperformance.
Build & Systems Quality
15%
[94/100]
High-quality conversion, fully modernized systems, classic restoration. No structural or maintenance issues on public record after a decade of residential use.
Sustainability & Wellness
10%
[72/100]
Building-wide air filtration and updated mechanical systems. One honest caveat: 1107 Broadway holds a Local Law 33 energy grade of "D" (score 48), which is below average for the asset class. The adaptive reuse of a 1915 structure creates inherent efficiency challenges, but buyers should factor this into long-term carrying cost projections and monitor future compliance costs under Local Law 97.
Appreciation Upside
10%
[80/100]
Park-facing and corner-exposure units retain genuine scarcity value. Standard and lower-floor units are likely to track the neighborhood average. Long-term holders of trophy units are better positioned than those expecting short-term appreciation across all floor tiers.
Rental & Exit Liquidity
5%
[90/100]
Strong resale history, diverse buyer pool including international buyers. NoMad rental inventory remains tight, supporting strong returns on well-positioned units.
Lifestyle Fit
5%
[91/100]
Pet-friendly, flexible layouts, luxury services. Central location at the intersection of NoMad, Flatiron, Chelsea, and Union Square. Works as a primary residence, pied-a-terre, or investment unit.
What Makes This Building Worth Owning
Adaptive Reuse & Systems Quality
  • A conversion of the former International Toy Center: the original masonry shell and structure preserved, with all mechanical systems fully modernized to current standards.
  • Updated HVAC, energy-efficient appliances, and building-wide air filtration, infrastructure that reduces long-term carrying costs.
Layout Advantage
  • Generously scaled floorplans, a legacy of the building's commercial origins, that are meaningfully larger than typical new construction at comparable price points.
  • Select residences include private terraces with park or skyline exposures, a rare premium in this price tier.
Design Integrity
  • Alan Wanzenberg interiors defined by natural stone, warm wood tones, and proportional restraint, a design language that holds its appeal and its value.
Investment Case
  • Consistently strong demand from finance, technology, and consulting professionals, a buyer profile that supports price stability and rapid liquidity in any market environment.
Amenity Depth
  • 10,000 sq. ft. amenity floor: 60-ft lap pool, full spa, yoga studio, residents' lounge, children's playroom, and 24-hour concierge. An amenity package that competes with buildings priced significantly higher.
Inside This Building
Photos
10 Madison Square West, #19C - Dining Room
10 Madison Square West, #19C - Kitchen
10 Madison Square West 19C Primary
10 Madison Square West 19C Living Room 2
10 Madison Square West 19C Primary
10 Madison Square Bedroom
10 Madison Square West, #19C - Dining Room
10 Madison Square West, #19C - Kitchen
10 Madison Square West 19C Primary
10 Madison Square West 19C Living Room 2
10 Madison Square West 19C Primary
10 Madison Square Bedroom
Video Tour
Neighborhood Map
Flatiron District occupies a rare convergence point: walkable distance to Midtown business districts, immediate access to multiple subway lines, and the sustained desirability of Madison Square Park frontage. The neighborhood has demonstrated consistent price premiums and strong buyer demand across market cycles.
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