A rare opportunity to own a distinguished piece of Mendham Township history. Originally built in 1830 and thoughtfully expanded over time, this exceptional Colonial is privately set on approximately 3 picturesque acres, seamlessly blending historic charm with modern luxury. Designed for both grand entertaining and everyday living, the home offers expansive gathering spaces, including an oversized great room and an elegant living room anchored by a wood-burning fireplace and adjoining library. The gourmet kitchen is appointed with a striking Ferrari Red Bertazzoni 5-burner gas range and hood, 42-inch Viking side-by-side refrigerator, Bosch dishwasher, and a handcrafted English country island, with direct access to a covered patio overlooking the serene grounds. A remarkable two-story barn, constructed in 1980 with reclaimed hand-hewn beams to reflect the home's original character, offers endless possibilities for entertaining, a studio, fitness space, home office, collector car storage, workshop, or more. Upstairs, the luxurious primary suite features a spa-inspired bath with soaking tub, separate shower, and dual vanity, complemented by two additional bedrooms and a versatile fourth room ideal as an office, den, or playroom. A truly timeless country estate where history, craftsmanship, and modern comfort come together.
Sale and tax history for 159 Mountainsid MOUNTAINSIDE Rd
Sale History
Tax History
Date
Event
Price
GSMLS #4045356
Sep 25, 2026
Pending
—
Aug 7, 2026
Listed
$1,150,000
Aug 6, 2026
Coming Soon
$1,150,000
+39
A rare opportunity to own a distinguished piece of Mendham Township history. Originally built in 1830 and thoughtfully expanded over time, this exceptional Colonial is privately set on approximately 3 picturesque acres, seamlessly blending historic charm with modern luxury. Designed for both grand entertaining and everyday living, the home offers expansive gathering spaces, including an oversized great room and an elegant living room anchored by a wood-burning fireplace and adjoining library. The gourmet kitchen is appointed with a striking Ferrari Red Bertazzoni 5-burner gas range and hood, 42-inch Viking side-by-side refrigerator, Bosch dishwasher, and a handcrafted English country island, with direct access to a covered patio overlooking the serene grounds. A remarkable two-story barn, constructed in 1980 with reclaimed hand-hewn beams to reflect the home's original character, offers endless possibilities for entertaining, a studio, fitness space, home office, collector car storage, workshop, or more. Upstairs, the luxurious primary suite features a spa-inspired bath with soaking tub, separate shower, and dual vanity, complemented by two additional bedrooms and a versatile fourth room ideal as an office, den, or playroom. A truly timeless country estate where history, craftsmanship, and modern comfort come together.
NJMLS #26029585
Sep 2, 2026
Contingent
—
Aug 6, 2026
Listed
$1,150,000
+38
A rare opportunity to own a distinguished piece of Mendham Township history. Originally built in 1830 and thoughtfully expanded over time, this exceptional Colonial is privately set on approximately 3 picturesque acres, seamlessly blending historic charm with modern luxury. Designed for both grand entertaining and everyday living, the home offers expansive gathering spaces, including an oversized great room and an elegant living room anchored by a wood-burning fireplace and adjoining library. The gourmet kitchen is appointed with a striking Ferrari Red Bertazzoni 5-burner gas range and hood, 42-inch Viking side-by-side refrigerator, Bosch dishwasher, and a handcrafted English country island, with direct access to a covered patio overlooking the serene grounds. A remarkable two-story barn, constructed in 1980 with reclaimed hand-hewn beams to reflect the home's original character, offers endless possibilities for entertaining, a studio, fitness space, home office, collector car storage, workshop, or more. Upstairs, the luxurious primary suite features a spa-inspired bath with soaking tub, separate shower, and dual vanity, complemented by two additional bedrooms and a versatile fourth room ideal as an office, den, or playroom. A truly timeless country estate where history, craftsmanship, and modern comfort come together.
HCMLS #260015964
Sep 15, 2026
Pending
—
Aug 6, 2026
Listed
$1,150,000
Public Records
Sep 23, 2013
Sold
$395,000
GSMLS #2958964
Jul 10, 2013
Sold
$395,000
Year
Property tax
Land + Additions
Assessment*
2026
$17,790 (+15.9%)
$386,100 + $656,100
$1,042,200
2025
$15,354 (+1.7%)
$386,100 + $656,100
$1,042,200
2024
$15,093 (+2.1%)
$376,600 + $458,300
$834,900
2023
$14,782 (+1.6%)
$341,100 + $436,100
$777,200
2022
$14,553 (−1.8%)
$296,300 + $411,300
$707,600
2021
$14,814 (+0.6%)
$289,200 + $399,200
$688,400
2020
$14,720 (+1.9%)
$374,300 + $295,100
$669,400
2019
$14,446 (+11.0%)
$374,300 + $295,100
$669,400
2018
$13,013 (+2.4%)
$374,300 + $295,100
$669,400
2017
$12,712 (+0.1%)
$374,300 + $240,400
$614,700
2016
$12,693 (+4.2%)
$374,300 + $240,400
$614,700
2014
$12,177 (+2.2%)
$374,300 + $240,400
$614,700
2013
$11,913 (+1.0%)
$374,300 + $240,400
$614,700
2012
$11,790 (+0.9%)
$374,300 + $240,400
$614,700
2011
$11,685 (+0.7%)
$374,300 + $240,400
$614,700
2010
$11,599 (+2.6%)
$374,300 + $240,400
$614,700
2009
$11,305
$374,300 + $240,400
$614,700
Public record
Beds
—
Baths
—
Stories
2
Lot width
—
Lot depth
—
Lot size
2.48 Acres
Year renovated
—
Finished Sq. Ft.
3,217
Unfinished Sq. Ft.
—
Total Sq. Ft.
3,217
Year built
1830
Style
Single Family Residential
County
Morris County
APN
1900117 00042
Parking Spaces
—
Basement
—
Accessible
—
HOA Dues
—
Garage
—
Features
—
Last updated by owner on Oct 8, 2026.
Climate risks
1/10 Flood Factor
Minimal risk of a flood reaching the building in the next 30 years
1/10 Fire Factor
Unlikely to be in a wildfire in next 30 years
5/10 Heat Factor
7 days above 97° expected this year, 14 days in 30 years
5/10 Wind Factor
24% chance of strong winds in next 30 years
3/10 Air Factor
2 unhealthy days expected this year, 3 days in 30 years
Provided by First Street
Historical weather
Mendham, NJ • 07945-1721
Average low and high temperatures (°F)
34
20
38
23
56
34
64
43
70
51
81
61
86
66
81
60
77
58
67
46
54
38
39
25
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
Sun exposure
84/ 100
Very good sunlight
Sunscore
This home receives average direct sun exposure in Mendham. There appears to be minimal shading by surrounding buildings, terrain, and vegetation.
9 hrs
6.4 hrs
JuneDecember
Provided by Shadowmap
Redfin Estimate for 159 Mountainsid MOUNTAINSIDE Rd
$1,155,604
$5,604 over list price of $1.15M
Nearby comparable homes
The Redfin Estimate uses 6 recent nearby sales, priced between $835K to $1.3M.