Manhattan

Lefcourt National Building - 521 5th Avenue, New York, NY 10175 - Property report

Also known as: 1 E 43rd St

Property image for Lefcourt National Building - 521 5th Avenue, New York, NY 10175

Property type

Office Only with or without Commercial - 20 Stories or More (O4)

Year built

1929

Lot sq. ft.

19,047

Sale price

$379,283,537

General information

Address

Building name

Lefcourt National Building

Primary address

Lefcourt National Building - 521 5th Avenue

Alternate address(es)

1 E 43rd St
519-525 5th Ave

ZIP code

10175

Neighborhood

Central Midtown

Borough

Manhattan

Block & lot

01278-0001

Building

Property type

Office Only with or without Commercial - 20 Stories or More (O4)

Building sq. ft.

434,152

Building dimensions

104 ft x 184 ft

Buildings on lot

Stories

Year built

1929

Last altered

2019

Building material

Sales

Sale date

05/22/2019

Sale price

$379,283,537

Tax

Tax year

2026-2027

Property tax

$7,919,040

Tax class

Zoning & Use

Zoning

Commercial units

Office sq. ft.

Retail sq. ft.

Lot

Lot dimensions

104 ft x 184.33 ft

Lot sq. ft.

19,047

Floor area ratio (FAR)

Commercial FAR

Residential FAR

Current built area

434,081 sq. ft.

Buildable area

Area overview

Walk score

99 /100. Walker's Paradise

Transit score

100 /100. Rider's Paradise

Bike score

90 /100. Biker's Paradise

School district

Community district

Closest police station

0.48 Miles

Closest fire station

0.11 Miles

View more such as transportation, nearby schools and risk designations.

Ownership

Ownership information for Lefcourt National Building - 521 5th Avenue, New York, NY

Unlock full ownership info — get contact details, including phone numbers and emails for owners and the real people behind LLCs.

Property owner name

Registered owner

Source

Deed

Owner contact information

Phone number

Owner address

Documents

Sales history for Lefcourt National Building - 521 5th Avenue, New York, NY 10175

Sale date	Sale price	Buyer name	Seller name
05/22/2019	$379,283,537	XXX XXXXX XXXXXX XXXXXXXX XXXXXXXXX XX, XXX	XXX XXXXX XXX XXXXX XXX
12/06/2012	$170,000,000	XXX XXXXX XXX XXXXX XXX	XXXXX XXX XXXXX XXXXXX XXX
04/21/2011	$225,000,000	XXXXX XXX XXXXX XXXXXX XXX	XXX-XXX XXX XXX XXX XXX-XXX XXX XXX

*Most recent sales on record for this property.

More about New York City property records.

Title documents

Date	Type	Party 1	Party 2
08/21/2024 - R 04/25/2024 - D	NYC Real Property Transfer Tax (2024061700891001)	XXX XXXXXX XX XXX	XXXXXXXX XXXXXXXXXXX XXXX
12/22/2023 - R	UCC3 Continuation (2023121800184001)	XXX XXXXX XXXXXX XXXXXXXX XXXXXXXXX XX XXX	XXXXX XXXXX XXXX XXXXXXXX XXXXXXXXXXX XX XXXXXXX
12/05/2023 - R 11/29/2023 - D	Agreement (2023120500394001)	XXXXX XXXXX XXXX XXXXXXXX XXXXXXXXXXX	XXX XXXXX X XXXXX XXXXXXXX XXXXXXXXX XX XXX
08/06/2019 - R	UCC3 Assignment (2019080600169003)	XXX XXXXX XXXXXX XXXXXXXX XXXXXXXXX XX XXX	XXXXXXXX XXXX XX XXX XXXX XXXXXX
08/06/2019 - R 06/20/2019 - D	Asgn of Asgn of L&R (2019080600169002)	XXXXXXXX XXXX XX XXX XXXX XXXXXX	XXXXX XXXXX XXXX XXXXXXXX XXXXXXXXXXX XX XXXXXXX
08/06/2019 - R 06/20/2019 - D	Assignment, Mortgage (2019080600169001)	XXXXXXXX XXXX XX XXX XXXX XXXXXX	XXXXX XXXXX XXXX XXXXXXXX XXXXXXXXXXX XX XXXXXXX
06/14/2019 - R	Initial UCC1 (2019060400284006)	XXX XXXXX XXXXXX XXXXXXXX XXXXXXXXX XX XXX	XXXXXXXX XXXX XX XXX XXXX XXXXXX
06/14/2019 - R 05/22/2019 - D	Agreement (2019060400284008)	XXXXXXXX XXXX XX XXX XXXX XXXXXX	XXX XXXXX XXXXXX XXXXXXXX XXXXXXXXX XX XXX
06/14/2019 - R 05/22/2019 - D	Agreement (2019060400284007)	XXXXXXXX XXXX XX XXX XXXX XXXXXX	XXX XXXXX XXXXXX XXXXXXXX XXXXXXXXX XX XXX
06/14/2019 - R 05/22/2019 - D	Assignment of Leases and Rents (2019060400284005)	XXX XXXXX XXXXXX XXXXXXXX XXXXXXXXX XX XXX	XXXXXXXX XXXX XX XXX XXXX XXXXXX

*Most recent recorded documents on file for this property.

R: Recorded date
D: Document date

Tax

Property taxes for Lefcourt National Building - 521 5th Avenue, New York, NY

Property tax data includes tax amount, market value and assessed value, exemptions, abatements and assessment history.

Current property tax

Tax year

2025-2026

Property tax

$7,919,040

Municipal exemptions

Recent tax assessments

Market value

$162,222,200

Assessed value

$73,000,000

More about New York City Property Taxes

Assessment history

See the assessment and property tax history, including the evolution of the total tax rate and corresponding property tax amount.

Tax year	Market value	Assessed value	Taxable amount	Tax rate	Base tax	Property tax	Y-o-Y change
2025/26	$179,267,000	$80,670,150	$74,980,403	10.848%	$8,133,874	$8,133,874	-0.01%
2024/25	$171,851,000	$77,332,950	$75,590,787	10.762%	$8,135,080	$8,135,080	+11.73%
2023/24	$153,796,000	$69,208,200	$68,742,900	10.592%	$7,281,248	$7,281,248	+0.63%
2022/23	$151,043,000	$67,969,350	$67,969,350	10.646%	$7,236,017	$7,236,017	+21.08%
2021/22	$123,478,000	$55,565,100	$55,565,100	10.755%	$5,976,027	$5,976,027	-21.78%
2020/21	$168,354,000	$75,759,300	$71,441,280	10.694%	$7,639,930	$7,639,930	+5.71%
2019/20	$167,139,000	$75,212,550	$68,589,418	10.537%	$7,227,267	$7,227,267	+6.73%
2018/19	$162,704,000	$73,216,800	$64,406,908	10.514%	$6,771,742	$6,771,742	+8.35%
2017/18	$153,847,000	$69,231,150	$59,443,948	10.514%	$6,249,937	$6,249,937	+8.42%
2016/17	$141,748,000	$63,786,600	$54,517,168	10.574%	$5,764,645	$5,764,645	+6.33%

Permits

Permit information for Lefcourt National Building - 521 5th Avenue, New York, NY

Filing date	Job type	Job status	Job description	Initial cost
08/18/2026	Alteration
06/05/2026	Alteration
04/27/2026	Alteration
02/19/2026	Alteration
09/30/2025	Alteration

*Most recent permits on record for this property.

More about New York City property records

Violations

DOB Violations

Violation ID	Issue date	Type	Status
	02/21/2023	Fisphaz-hazardous condition (facade) facade required
	11/23/2021	E-elevator elevatorrequired
	07/03/2019	C-construction

*Most recent DOB violations on record for this property.

Listings

Commercial listings at Lefcourt National Building - 521 5th Avenue, New York, NY 10175

Photo	Listing Type	Property Type	Price	Sq. ft.	Listing Date	Last Updated
	For Lease	Interior Retail	Listing price not available	22,238	04/02/2025	09/08/2026	View listing

Neighborhood

Manhattan commercial market stats

Review a detailed real estate market overview of Manhattan and assess current trends, property values, property types sold and transaction volumes. View the median price per square foot in Manhattan and compare it to other New York City boroughs.

Q2 2026 median price/sq. ft.

$729

10.4% Y-o-Y

Q1 2026 median price/sq. ft.

$807

22.4% Y-o-Y

2025 median price/sq. ft.

$630

-8.1% Y-o-Y

Check out recently sold homes in Manhattan and see how their prices compare.

Risk

Create a free account to unlock expanded risk information, such as crime incidents in the area, tsunami and landslides risks, or its location relative to FEMA flood zones and the Coastal Barriers Resources System Area (COBRA).

FEMA flood zones

FEMA flood zones

Hurricane evacuation zones

Subway & traffic

Closest station

Madison Ave & 42nd St at NW Corner

Station lines

GS-4-5-6-7

Distance (miles)

0.076

View subway map

Access the detailed traffic volume map for Lefcourt National Building - 521 5th Avenue, New York, NY 10175 to see estimated average daily traffic on streets surrounding the property as well as the types of properties in its vicinity. View daily traffic map

Neighbors for Lefcourt National Building - 521 5th Avenue, New York, NY

10 E 44th St, New York 535 5th Ave, New York 14 E 44th St, New York 6 E 43rd St, New York 505 5th Ave, New York 12 E 44th St, New York 3 E 44th St, New York 11 E 44th St, New York 330 Madison Ave, New York 3 E 43rd St, New York 6 E 44th St, New York 1 Vanderbilt Ave, New York 1 E 42nd St, New York 529 5th Ave, New York 501 5th Ave, New York 335 Madison Ave, New York 90 E 42nd St, New York 18 E 42nd St, New York

Frequently asked questions

What is the year built for Lefcourt National Building - 521 5th Avenue, New York, NY 10175?

The development at Lefcourt National Building - 521 5th Avenue, New York, NY 10175 was built in 1929.

What is the market value of Lefcourt National Building - 521 5th Avenue, New York, NY 10175?

The current market value of Lefcourt National Building - 521 5th Avenue, New York, NY 10175 is $162,222,200.

What is the total square footage of Lefcourt National Building - 521 5th Avenue, New York, NY 10175?

Lefcourt National Building - 521 5th Avenue, New York, NY 10175 has a total of 434,152 square feet.

What is the price per square foot for this property?

$873 per square foot is the price for Lefcourt National Building - 521 5th Avenue, New York, NY 10175.

How many commercial spaces does this building have?

The number of commercial spaces in this building is 61.

How many active listings does Lefcourt National Building - 521 5th Avenue, New York, NY 10175 have?

This address has 1 active listing(s).

Disclaimer

All data comes from government sources. No attempt has been made to validate it. No attempt has been made to validate the accuracy of the programming of this website.

Do not rely on this report to support investment decisions. The only authoritative source for the information in this report is the government agencies from which the data was acquired.