Start here

Homes for sale by state
Home buying tips
Before you start looking
The buying timeline

Afford it

Today's mortgage rates
Mortgage calculator
How much can I afford?
Get pre-approved

Make the deal

Writing a winning offer
Inspections & appraisals
Closing costs, itemized
Find a buyer's agent

Sell

Selling Options

What's my home worth?
Compare selling options
Get an instant cash offer
Buy before you sell

Resources

How selling works
When should I sell?
Home selling tips
Pricing your home
What's worth fixing first
Find a seller's agent

Home Loans

Find an Agent

Save search Advertise Sign In

Saved homes Saved searches Your tours Your inquiries Recently viewed Account settings

Save search

Map layers

Safety

Sex offendersRegistered offenders, from official state registriesCamerasLicense-plate readers, CCTV and more, as mapped on OpenStreetMap

Safety & registry resources

Review official public-safety information for any area from these government sources:

U.S. Dept. of Justice National Sex Offender Public Website (NSOPW)
FBI: state sex-offender registry directory

Commercial Real Estate for Sale and Lease in Mountainside, NJ | Realty.com

Buy

Start here

Homes for sale by state
Home buying tips
Before you start looking
The buying timeline

Afford it

Today's mortgage rates
Mortgage calculator
How much can I afford?
Get pre-approved

Make the deal

Writing a winning offer
Inspections & appraisals
Closing costs, itemized
Find a buyer's agent

Save search Advertise Sign In

Saved homes Saved searches Your tours Your inquiries Recently viewed Account settings

Residential
Rentals

6 listings

Sell

Selling Options

What's my home worth?
Compare selling options
Get an instant cash offer
Buy before you sell

Resources

How selling works
When should I sell?
Home selling tips
Pricing your home
What's worth fixing first
Find a seller's agent

Home Loans

Find an Agent

Save search

Commercial Real Estate for Sale and Lease in Mountainside, NJ

Hide Map

6 Listings

6 listings

Commercial Real Estate for Sale and Lease in Mountainside, NJ

Hide Map

6 Listings

Map

Commercial Real Estate for Sale and Lease in Mountainside, NJ

6 Listings

12Active
$1,725/mo

— bd · — ba · — sqft

917 Mountain Avenue, Suite 1, Mountainside, NJ

PROMINENT PROPERTIES SIR

9Active

$1,680/mo

— bd · — ba · — sqft

917 Mountain Avenue, Suite 2, Mountainside, NJ

PROMINENT PROPERTIES SIR

15Active

$3,600/mo

— bd · — ba · — sqft

917 Mountain Avenue, Mountainside, NJ

PROMINENT PROPERTIES SIR

31Active

$1,750,000

— bd · 0 ba · 5,580 sqft

1299 US Route 22 Highway E, Mountainside, NJ

JANICE GOOD PIGA · COLDWELL BANKER REALTY

29Active

$1,750,000

— bd · — ba · — sqft

1299 US Highway 22, Mountainside, NJ

COLDWELL BANKER REALTY

3Active

$4,500,000

— bd · — ba · — sqft

855-859 Mountain Avenue, Mountainside, NJ

COLDWELL BANKER REALTY

Listing data & MLS disclosures

All Jersey MLS: The data relating to real estate for sale on this web-site comes in part from the Internet Data Exchange Program of Central Jersey Multiple Listing System, Inc. Real Estate listings held by brokerage firms other than Realty.com are marked with the IDX logo. The Central Jersey Multiple Listing System, Inc. does not warrant the accuracy, quality, reliability, suitability, completeness, usefulness or effectiveness of any information provided. The information being provided is for consumers' personal, non-commercial use and may not be used for any purpose other than to identify prospective properties consumers may be interested in purchasing or renting. Information deemed reliable but not guaranteed. Copyright © 2026 Central Jersey Multiple Listing System, Inc. All rights reserved. The Central Jersey Multiple Listing System, Inc. retains all rights, title and interest in and to its trademarks, service marks and copyrighted material.
Garden State MLS: The data displayed relating to real estate for sale comes in part from the IDX Program of Garden State Multiple Listing Service, L.L.C. Real estate listings held by other brokerage firms are marked as IDX Listing. This information is being provided for Consumers' personal, non-commercial use and may not be used for any purpose other than to identify prospective properties Consumers may be interested in purchasing. Notice: The dissemination of listings displayed herein does not constitute the consent required by N.J.A.C. 11:5.6.1 (n) for the advertisement of listings exclusively for sale by another broker. Any such consent must be obtained in writing from the listing broker. Information deemed reliable but not guaranteed. Copyright © 2026 Garden State Multiple Listing Service, L.L.C. All Rights Reserved.

Mountainside, NJ community profile

Population: 7,176
Median income: $137,684
Housing units: 2,659
People per sq. mi.: 1,708.6
Area: 4.2 sq. mi.

Source: HJN community data

L. Custen Realty, Inc. d/b/a Realty.com/L. Custen Realty CT, LLC d/b/a Realty.com (Tom O’Leary-Broker)(CT properties only), 8323 Southwest Freeway, Suite 900, Houston, Texas 77074

The information provided by this website is for the personal, non-commercial use of consumers and may not be used for any purpose other than to identify prospective properties consumers may be interested in purchasing. Listing data is derived from various Multiple Listing Services; each source MLS and its required disclaimer are shown with the listings on the applicable page. Realty.com is an independently owned and operated brokerage.

Listing data & MLS disclosures

All Jersey MLS: The data relating to real estate for sale on this web-site comes in part from the Internet Data Exchange Program of Central Jersey Multiple Listing System, Inc. Real Estate listings held by brokerage firms other than Realty.com are marked with the IDX logo. The Central Jersey Multiple Listing System, Inc. does not warrant the accuracy, quality, reliability, suitability, completeness, usefulness or effectiveness of any information provided. The information being provided is for consumers' personal, non-commercial use and may not be used for any purpose other than to identify prospective properties consumers may be interested in purchasing or renting. Information deemed reliable but not guaranteed. Copyright © 2026 Central Jersey Multiple Listing System, Inc. All rights reserved. The Central Jersey Multiple Listing System, Inc. retains all rights, title and interest in and to its trademarks, service marks and copyrighted material.
Garden State MLS: The data displayed relating to real estate for sale comes in part from the IDX Program of Garden State Multiple Listing Service, L.L.C. Real estate listings held by other brokerage firms are marked as IDX Listing. This information is being provided for Consumers' personal, non-commercial use and may not be used for any purpose other than to identify prospective properties Consumers may be interested in purchasing. Notice: The dissemination of listings displayed herein does not constitute the consent required by N.J.A.C. 11:5.6.1 (n) for the advertisement of listings exclusively for sale by another broker. Any such consent must be obtained in writing from the listing broker. Information deemed reliable but not guaranteed. Copyright © 2026 Garden State Multiple Listing Service, L.L.C. All Rights Reserved.

Mountainside, NJ community profile

Population: 7,176
Median income: $137,684
Housing units: 2,659
People per sq. mi.: 1,708.6
Area: 4.2 sq. mi.

Source: HJN community data