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Rent/Lease Office 345 Park Avenue South

Lease Office 345 Park Avenue South

$ / SF SF Monthly Rent
Negotiable
11,600
Negotiable
Please notify me when a new space is available
$ / SF SF Monthly Rent
$ / SF SF Monthly Rent

Nearby Sublease office Spaces for Rent

Address $ / SF SF Monthly Rent
Address $ / SF SF Monthly Rent
Address $ / SF SF Monthly Rent
Address $ / SF SF Monthly Rent
Madison Ave & East 29th Avenue $ 59
10,500
$ 51,625
Park Ave S & Between East 19th Street $ 60
7,700
$ 38,500
Fifth Ave & East 19th Street $ 77
8,800
$ 56,466
Fifth Ave & East 16th Street $ 42
10,100
$ 35,350
Address $ / SF SF Monthly Rent
Address $ / SF SF Monthly Rent
Address $ / SF SF Monthly Rent
Address $ / SF SF Monthly Rent
Address $ / SF SF Monthly Rent
Type of Space Class A/month Class B/month Class C/month
Windowed office/person
Interior office/person
Team Rooms
Suites

Nearby office Spaces for Rent

Address $ / SF SF Monthly Rent
Madison Ave & East 25th Street $ 92
9,100
$ 69,766
Park Ave S & East 20th Street $ 80
13,000
$ 87,208
Address $ / SF SF Monthly Rent
Park Ave S & East 17th Street $ 95
4,000
$ 31,666
Address $ / SF SF Monthly Rent
Address $ / SF SF Monthly Rent
Madison Ave & East 29th Avenue $ 60
8,300
$ 41,845
E 23rd St & Park Avenue $ 42
18,400
$ 63,633
Broadway & East 20th Street $ 70
18,200
$ 106,166
Park Ave S & Between East 19th Street $ 66
7,700
$ 42,670
Park Ave S & East 27th Street $ 75
8,700
$ 54,375
Fifth Ave & East 29th Street $ 78
12,500
$ 81,770
Park Ave S & East 27th Street $ 90
23,800
$ 179,491
Park Ave S & East 27th Street $ 70
13,100
$ 75,870
E 26th St & Fifth Avenue $ 125
12,100
$ 126,041
Park Ave S & East 26th Street $ 48
12,000
$ 48,000
Address $ / SF SF Monthly Rent
Broadway & Between East 19th Street $ 76
5,300
$ 33,787
E 23rd St & Park Avenue $ 42
6,100
$ 21,604
Broadway & East 20th Street $ 76
3,700
$ 23,587
Fifth Ave & East 29th Street $ 74
4,700
$ 28,787
Park Ave S & East 26th Street $ 71
3,900
$ 23,075
Park Ave S & East 26th Street $ 75
2,700
$ 16,875
University Pl & East 12th Street $ 50
6,500
$ 27,354
Broadway & East 18th Street $ 73
2,500
$ 15,208
Union Sq W & East 16th Street $ 67
3,700
$ 20,658
Address $ / SF SF Monthly Rent
Broadway & Between East 19th Street $ 75
2,200
$ 13,750
E 23rd St & Third Avenue $ 46
2,400
$ 9,100
Park Ave S & East 26th Street $ 63
2,100
$ 11,025
Fifth Ave & East 29th Street $ 73
2,000
$ 12,100
Broadway & East 18th Street $ 74
1,800
$ 11,025
Address $ / SF SF Monthly Rent
E 19th St & Broadway $ 52
7,700
$ 33,687
Madison Ave & East 30th Street $ 39
11,000
$ 35,750
E 23rd St & Lexington Avenue $ 67
21,600
$ 120,600
Address $ / SF SF Monthly Rent
E 23rd St & Park Avenue $ 35
2,800
$ 8,166
E 19th St & Broadway $ 55
5,500
$ 25,208
Fifth Ave & East 29th Street $ 60
2,500
$ 12,395
Fifth Ave & Between East 28th Street $ 53
5,000
$ 22,083
Address $ / SF SF Monthly Rent
E 28th St & Park Avenue South $ 38
2,300
$ 7,379
Broadway & East 21st Street $ 74
1,800
$ 11,175

Retail Spaces for Rent at 345 Park Avenue South

Rent Medical Space at 345 Park Avenue South

Tenant Broker’s Perspective: Return-to-office mandates are driving up rental prices at 345 Park Avenue South. This trend is projected to continue. Opportunities for subleases remain available at 345 Park Avenue South and in the nearby Gramercy Park neighborhood.
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345 Park Avenue South Property Overview

Building Address: 345 Park Avenue South, New York NY 10010
Building Name: The Iselin Bldg
Building Alternate Address: 345 Park Ave South
Zip Code:10010
Neighborhood:Gramercy Park
Borough:Manhattan
Stories:12
Year Built:1912
Building Class:A

345 Park Avenue South, located in Midtown South, Manhattan, NYC, is a historic building originally completed in 1912 and designed by William H. Whittal. It was once known as the Armory Building.

The building underwent a full-scale renovation in 2021 by Deerfield, transforming it into a state-of-the-art office and life sciences hub known as CURE. This 12-story structure features lab-ready spaces, flexible office space, and a plethora of modern amenities. These include a rooftop terrace, lounge club, and fitness center, making it an attractive destination for life sciences, healthcare, and biotech companies.

Managed by RFR Realty and owned by Deerfield, 345 Park Avenue South offers approximately 300,000 square feet of office space. It is strategically located near the Flatiron District and Madison Square Park, with easy access to public transportation and upscale amenities.

345 Park Avenue South is located in the heart of Silicon Alley, Manhattan, providing a vibrant hub for innovation in the life sciences, digital health, and technology sectors.

This location is home to a premier life science facility, offering state-of-the-art lab spaces, ample amenities, and a collaborative community of leading companies. The building hosts a range of tenants involved in healthcare and biotech industries.

Originally built in 1912, the property was transformed into a Class A office and life sciences hub through a major renovation in 2021. It features 300,000 square feet of space across its 12 floors, including flexible office areas and ground-floor retail.

The area offers excellent connectivity, with easy access to major public transportation options and proximity to Madison Square Park.

Contact information for general inquiries about the building can be directed to its location at 345 Park Ave S, New York, NY 10010.


345 Park Avenue South in Manhattan offers a range of amenities:

  • Rooftop terrace with flexible event space and stunning views of Manhattan.
  • Lounge club and kitchen.
  • Renovated lobby.
  • Fitness center (available at an additional cost).
  • Exclusive wine cellar.
  • State-of-the-art conference center.
  • Conference rooms and huddle spaces.
  • NaCl Café on the 12th floor.
  • 2nd floor Education Center.


345 Park Avenue South in Manhattan, NYC, is home to several notable tenants. The building, part of Deerfield's CURE. life sciences hub, hosts tenants such as:

  • Deerfield
  • ProTara Therapeutics
  • Test Now and Go
  • Bank of America Financial Center
  • Helaina

Additionally, the Upland restaurant is located on the ground floor.


345 Park Avenue South, located in the heart of Manhattan, offers a prime spot for businesses and residents seeking reliable internet services. The area is covered by several top-tier internet providers, ensuring fast and consistent connectivity. Here are some of the internet providers likely available in the building:

Providers and Services:

  • Verizon Fios: Known for its fiber-optic connections, offering speeds up to 2 Gbps and competitive pricing.
  • Optimum: Offers high-speed plans up to 8 Gbps, ideal for demanding users.
  • Astound Broadband Powered by RCN: Provides affordable high-speed plans with unlimited data and fiber-optic connections.
  • Spectrum: Offers cable internet with speeds up to 1 Gbps and no data caps.

345 Park Avenue South, located in the heart of Midtown South, Manhattan, offers convenient access to multiple transportation options. The nearest subway stations include 28th Street, 23rd Street, and 33rd Street, with the 28th Street station being a 4-minute walk away. Bus stops are also nearby, including those on East 23rd Street and Madison Avenue, which is a 5-minute walk. The cross streets are Park Avenue South and Lexington Avenue, providing easy access to various amenities, restaurants, and parks in the area.


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Tenant Representation: Optimal Spaces acts exclusively as a "Tenant Broker," only representing tenants, never landlords.
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Why Optimal Spaces –
Tenant Broker

  • No fee for clients renting space.
  • We work for YOU, not the landlord.
  • Save 15–20% on your business costs.
  • Save 100–200 hours of research.
  • Access to all available spaces.
  • Specialized real estate expertise.

Alone or with other broker

  • Miss deals and hard-to-find spaces.
  • Potential conflict of interest (often represent landlords).
  • Only 10% of available spaces are online.
  • Lack of specialized expertise.
  • May not get the best terms or uncover hidden costs.
Why Use a Tenant Broker: Your Advocate in Commercial Real Estate
1. The Crucial Distinction: Whose Side Are They On?
Landlord Rep (Listing Agent) — Fiduciary Duty: Landlord. Highest rent, best terms for landlord.
Tenant Rep (Tenant Broker) — Fiduciary Duty: Tenant Only. Lowest rent, best terms for tenant. Levels the playing field.
2. It Almost Always Costs You Nothing
3. Access to “Hidden” Inventory
4. Negotiating Beyond Base Rent
Landlord pays the broker fee — free expert representation for the tenant.
Access to hidden inventory: off-market listings, subleases, and future availabilities via broker databases and networks.
Negotiating beyond base rent: free rent, TI allowance, OPEX caps, and lease flexibility for renewal or expansion.
5. Time Savings & Process Management
6. Mitigating Risk (the “Gotchas”)
Tenant broker handles searching, scheduling, and RFPs — your outsourced real estate department with curated options and timeline management.
Mitigating risk: spotting pitfalls in LOI and lease such as restoration clauses and holdover penalties.
Summary: Don’t rely on the landlord’s agent. A tenant broker is your advocate, provides better data, negotiates a complete package, and typically costs you nothing.

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