How much do condos cost at Echelon Seaport (135 Seaport)?

In the past 12 months, 12 condos sold at Echelon Seaport (135 Seaport) (135 Seaport Blvd, Boston) for a typical $1,497,500, or $1,669 per square foot. Sales ranged from $795,000 to $3,495,000.

How fast do condos sell at Echelon Seaport (135 Seaport)?

Units that sold in the past 12 months took a typical 49 days to get an accepted offer, and 42% sold for their first asking price or more. In the Seaport District overall, it took 38 days.

What are the condo fees at Echelon Seaport (135 Seaport)?

The typical monthly condo fee at Echelon Seaport (135 Seaport) is $1,890, about $2.11 per square foot a month, based on the fees filed with its listings.

How many condos are for sale at Echelon Seaport (135 Seaport) right now?

14 units are for sale, asking from $795,000 to $4,495,000.

What does it cost to rent at Echelon Seaport (135 Seaport)?

21 units rented in the past 12 months, for a typical $5,550 a month. Studio: $4,100; 1 bedroom: $5,500; 2 bedrooms: $9,650.

When was Echelon Seaport (135 Seaport) built, and how many units does it have?

Echelon Seaport (135 Seaport) was built in 2020 and has 192 units, with homes up to the 25th floor, according to its listings.

Building report · Seaport District, Boston

Echelon Seaport (135 Seaport)

135 Seaport Blvd, Boston, MA 02210

12 condos sold at Echelon Seaport (135 Seaport) in the past 12 months, for a typical $1.5M, or $1,669 a square foot. Right now, 14 are for sale and 2 are for rent.

2020 built
192 units
25 floors with homes
#26 in Greater Boston by condo sales

Unit PH3B, for sale at $4,495,000. Listed by Laura Rodriguez, The Collaborative Companies. MLS #73594507.

$1.5M: typical sale price, past 12 months
$1,669: per square foot
49 days: typical time to an accepted offer
42%: sold for asking or more
14: for sale now
$1,890: typical monthly condo fee

Echelon Seaport (135 Seaport) sells close to the Seaport District norm

Condo sales in the past 12 months: this building against all 72 condo sales in Seaport District.

Seaport District Echelon Seaport (135 Seaport)

Price per sq ft ($)1,6971,669 −2%
Days to an accepted offer3849 +28%

Source: Verified market data; analysis by the Observer Markets Desk.

Show the numbers

	Echelon Seaport (135 Seaport)	Seaport District
Typical price per sq ft	$1,669	$1,697
Typical days to an accepted offer	49	38
Sold for asking or more	42%	38%

For sale now14 units, 7.3% of the building

$4,495,000
Unit PH3B, floor 25
2 bed · 2.5 bath · 2,164 sq ft
$2,077/sq ft · 17 days listed · $5,128/mo fee
Active · Condo · MLS #73594507
135 Seaport Blvd #PH3B, Boston, MA
Listed by Laura Rodriguez, The Collaborative Companies
$4,299,999
Unit 2008, floor 20
3 bed · 3 bath · 1,909 sq ft
$2,252/sq ft · 263 days listed · $4,038/mo fee
Active · Condo · MLS #73478748
135 Seaport Blvd #2008, Boston, MA
Listed by Santana Team, Keller Williams Realty Boston Northwest
$2,295,000Cut $100K
Unit 1806, floor 18
2 bed · 2.5 bath · 1,384 sq ft
$1,658/sq ft · 264 days listed · $3,020/mo fee
Active · Condo · MLS #73478219
135 Seaport Blvd #1806, Boston, MA
Listed by Post Advisory Group, Engel & Volkers Boston
$1,999,000Cut $150K
Unit 1807, floor 18
2 bed · 2 bath · 1,164 sq ft
$1,717/sq ft · 762 days listed · $2,425/mo fee
Active · Condo · MLS #73300005
135 Seaport #1807, Boston, MA
Listed by The Sarkis Team, Douglas Elliman Real Estate - The Sarkis Team
$1,995,000
Unit 1609, floor 16
2 bed · 2 bath · 1,164 sq ft
$1,714/sq ft · 196 days listed · $2,164/mo fee
Active · Condo · MLS #73508104
135 Seaport Blvd #1609, Boston, MA
Listed by Benjamin Lincoln, Compass
$1,899,000Cut $51K
Unit 1506, floor 15
2 bed · 2 bath · 1,013 sq ft
$1,875/sq ft · 165 days listed · $2,172/mo fee
Active · Condo · MLS #73525712
135 Seaport Blvd #1506, Boston, MA
Listed by Joseph Salines, Douglas Elliman Real Estate

Show all 14 for sale

$1,610,000Cut $70K
Unit 1106, floor 11
2 bed · 2 bath · 1,011 sq ft
$1,592/sq ft · 131 days listed · $2,119/mo fee
Active · Condo · MLS #73543793
135 Seaport Blvd #1106, Boston, MA
Listed by Yunliang Lin, Pradium Realty
$1,590,000Cut $90K
Unit 906, floor 9
2 bed · 2 bath · 1,011 sq ft
$1,573/sq ft · 192 days listed · $1,951/mo fee
Active · Condo · MLS #73511074
135 Seaport Blvd #906, Boston, MA
Listed by Amy Goldberg, Compass
$1,450,000
Unit 1703, floor 17
1 bed · 1 bath · 856 sq ft
$1,694/sq ft · 61 days listed · $1,969/mo fee
Active · Condo · MLS #73574809
135 Seaport Blvd #1703, Boston, MA
Listed by Jason Jeon, Compass
$1,095,000
Unit 1508, floor 15
1 bed · 1 bath · 670 sq ft
$1,634/sq ft · 46 days listed · $1,517/mo fee
Active · Condo · MLS #73582051
135 Seaport Blvd #1508, Boston, MA
Listed by Winston Li, Blue Ocean Realty, LLC
$1,095,000Cut $100K
Unit 1016, floor 10
1 bed · 1 bath · 648 sq ft
$1,690/sq ft · 82 days listed · $1,420/mo fee
Active · Condo · MLS #73565415
135 Seaport Blvd #1016, Boston, MA
Listed by Doug Gribbel, Compass
Virtual tour
$1,015,000
Unit 808, floor 8
1 bed · 1 bath · 664 sq ft
$1,529/sq ft · 194 days listed · $1,394/mo fee
Active · Condo · MLS #73509056
135 Seaport Blvd #808, Boston, MA
Listed by Wendy Wang, Downtown Boston Real Estate, LLC
$829,000
Unit U18, floor 17
Studio · 1 bath · 505 sq ft
$1,642/sq ft · 105 days listed · $1,098/mo fee
Active · Condo · MLS #73555376
135 Seaport Blvd #U18, Boston, MA
Listed by Laura Rodriguez, The Collaborative Companies
$795,000Cut $4,000
Unit 818, floor 8
Studio · 1 bath · 506 sq ft
$1,571/sq ft · 35 days listed · $852/mo fee
Active · Condo · MLS #73586803
135 Seaport Blvd #818, Boston, MA
Listed by Rodney Scott, Engel & Volkers Boston

Under agreement2 units

$1,349,000
Unit 1503, floor 15
1 bed · 1 bath · 857 sq ft
$1,574/sq ft · 12 days listed · $1,868/mo fee
Under agreement · Condo · MLS #73596177
135 Seaport Blvd #1503, Boston, MA
Listed by Kopman Adler Team, Compass
$825,000
Unit 530, floor 5
1 bed · 1 bath · 546 sq ft
$1,511/sq ft · 160 days listed · $825/mo fee
Under agreement · Condo · MLS #73528625
135 Seaport Blvd #530, Boston, MA
Listed by Laura Rodriguez, The Collaborative Companies

For rent now2 units

$6,000/mo
Unit 1111, floor 11
1 bed · 1 bath · 765 sq ft
23 days listed
For rent · Condo rental · MLS #73592183
135 Seaport Blvd #1111, Boston, MA
Listed by Lucy Su, Keller Williams Realty Boston Northwest
$3,500/mo
Unit UNIT 818, floor 8
Studio · 1 bath · 506 sq ft
78 days listed
For rent · Condo rental · MLS #73567174
135 Seaport Blvd #UNIT 818, Boston, MA
Listed by Rodney Scott, Engel & Volkers Boston

Price per square foot at Echelon Seaport (135 Seaport), quarter by quarter

Typical sale price per square foot, every sale in our data since 2025 Q4.

$ per sq ft 1,831 (2026 Q4)

Seaport District typical, past 12 months: $1,697. Source: Verified market data; analysis by the Observer Markets Desk.

Show the numbers

Quarter	Typical $/sq ft	Sales
2025 Q4	$1,641	4
2026 Q1	$1,739	2
2026 Q2	$1,660	4
2026 Q4	$1,831	2

Higher floors sell for 13% more per square foot

Typical sale price per square foot by floor, past 12 months.

Floors 1–9$1,7103 sales
Floors 10–17$1,6176 sales
Floors 18–25$1,9343 sales

Source: Verified market data; analysis by the Observer Markets Desk.

Show the numbers

Floors	Typical $/sq ft	Sales
Floors 1–9	$1,710	3
Floors 10–17	$1,617	6
Floors 18–25	$1,934	3

Buy or rent here?

Typical sale price and monthly rent by size, past 12 months. “Rent as % of price” is a year's rent divided by the price: the higher it is, the more renting here costs compared with buying.

Size	Sale price	Monthly rent	Rent as % of price
Studio	$847K (2)	$4,100 (4)	5.8%
1 bedroom	$1.3M (4)	$5,500 (11)	5.1%
2 bedrooms	$1.9M (5)	$9,650 (6)	6.1%
3+ bedrooms	$3.5M (1)	–	–

What soldPast 12 months, newest first

Closed	Unit	Size	Price	$/sq ft	vs. first ask
Oct 23	Unit 2007MLS #73561975 · Compass	2 bed, 1,608 sq ft	$3,270,000	$2,034	−6.6%
Oct 4	Unit 1509MLS #73569452 · Luxury Residential Group, LLC	2 bed, 1,164 sq ft	$1,895,000	$1,628	+0.0%
Jul 31	Unit 1203MLS #73526702 · Regatta Realty	1 bed, 857 sq ft	$1,250,000	$1,459	−8.6%
May 14	Unit 1718MLS #73514799 · The Collaborative Companies	Studio, 506 sq ft	$899,000	$1,777	+0.0%
May 7	Unit 1712MLS #73481476 · The Collaborative Companies	Studio, 495 sq ft	$795,000	$1,606	+0.0%
May 7	Unit 1020MLS #73469165 · Real Broker MA, LLC	2 bed, 1,406 sq ft	$2,087,500	$1,485	−4.0%
Apr 30	Unit 1708MLS #73472798 · Compass	1 bed, 664 sq ft	$1,137,500	$1,713	−5.2%
Jan 30	Unit 905MLS #73420370 · Douglas Elliman Real Estate - The Sarkis Team	2 bed, 1,024 sq ft	$1,625,000	$1,587	−7.1%
Jan 20	Unit 538MLS #73455803 · Douglas Elliman Real Estate - The Sarkis Team	1 bed, 712 sq ft	$1,347,000	$1,892	−3.4%
Dec 2	Unit 807MLS #73432090 · The Collaborative Companies	1 bed, 816 sq ft	$1,395,000	$1,710	+0.0%

Show all 12 sales

Closed	Unit	Size	Price	$/sq ft	vs. first ask
Nov 17	Unit 1903MLS #73405404 · Corcoran Property Advisors	2 bed, 1,044 sq ft	$1,600,000	$1,533	−20.0%
Nov 13	Unit 1810MLS #73432095 · The Collaborative Companies	3 bed, 1,807 sq ft	$3,495,000	$1,934	+0.0%

Where it isWith nearby buildings we track

Questions people ask

How much do condos cost at Echelon Seaport (135 Seaport)?: In the past 12 months, 12 condos sold at Echelon Seaport (135 Seaport) (135 Seaport Blvd, Boston) for a typical $1,497,500, or $1,669 per square foot. Sales ranged from $795,000 to $3,495,000.
How fast do condos sell at Echelon Seaport (135 Seaport)?: Units that sold in the past 12 months took a typical 49 days to get an accepted offer, and 42% sold for their first asking price or more. In the Seaport District overall, it took 38 days.
What are the condo fees at Echelon Seaport (135 Seaport)?: The typical monthly condo fee at Echelon Seaport (135 Seaport) is $1,890, about $2.11 per square foot a month, based on the fees filed with its listings.
How many condos are for sale at Echelon Seaport (135 Seaport) right now?: 14 units are for sale, asking from $795,000 to $4,495,000.
What does it cost to rent at Echelon Seaport (135 Seaport)?: 21 units rented in the past 12 months, for a typical $5,550 a month. Studio: $4,100; 1 bedroom: $5,500; 2 bedrooms: $9,650.
When was Echelon Seaport (135 Seaport) built, and how many units does it have?: Echelon Seaport (135 Seaport) was built in 2020 and has 192 units, with homes up to the 25th floor, according to its listings.

About these numbers

Every figure on this page comes from verified market data for 135 Seaport Blvd, Boston, refreshed November 8, 2026, and updates every morning. “Typical” means the median. Price per square foot uses the living area filed with each listing. Condo fees are monthly. Sales history in our data starts in late 2025.

Cite as: “Echelon Seaport (135 Seaport) building report,” Boston Real Estate Observer, https://bostonrealestateobserver.com/buildings/boston/135-seaport-blvd/ (data as of November 8, 2026).

The property listing data and information, or the Images, set forth herein were provided to MLS Property Information Network, Inc. from third party sources, including sellers, lessors, landlords and public records, and were compiled by MLS Property Information Network, Inc. The property listing data and information, and the Images, are for the personal, non commercial use of consumers having a good faith interest in purchasing, leasing or renting listed properties of the type displayed to them and may not be used for any purpose other than to identify prospective properties which such consumers may have a good faith interest in purchasing, leasing or renting. MLS Property Information Network, Inc. and its subscribers disclaim any and all representations and warranties as to the accuracy of the property listing data and information, or as to the accuracy of any of the Images, set forth herein.

Figures refresh every morning. This page was last updated November 8, 2026.

Echelon Seaport (135 Seaport) sells close to the Seaport District norm

For sale now14 units, 7.3% of the building

Under agreement2 units

For rent now2 units

Price per square foot at Echelon Seaport (135 Seaport), quarter by quarter

Higher floors sell for 13% more per square foot

Buy or rent here?

What soldPast 12 months, newest first

Where it isWith nearby buildings we track

Questions people ask

About these numbers

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