1233 Poplar Avenue: A Mother-Daughter Colonial in Mountainside, NJ

Featured Listing · MLS #4039351
1233 Poplar Avenue, Mountainside, New Jersey 07092

Is 1233 Poplar Avenue a Mother-Daughter or Multi-Generational Home?

Yes — and it’s one of the most complete mother-daughter setups on the market in Mountainside, NJ. This custom Colonial offers 5 bedrooms, 3.5 bathrooms, and more than 4,000 square feet across three finished levels, anchored by a newly finished 1,000-square-foot walk-out lower level with its own private entrance, full bathroom, bedroom, and living space. Built in 2015 on a 0.39-acre lot and listed at $1,825,000, the home sits close to Deerfield Elementary School, offers commuter access to NYC via NJ Transit and I-78/Route 22, and is minutes from Echo Lake Park and downtown Westfield.

Property Description

Step into 1233 Poplar Avenue through a two-story foyer with custom wainscoting and detailed millwork, and you’ll immediately feel the scale of this custom-built Colonial on its generous 0.39-acre lot. High ceilings and abundant natural light carry through the main level, where an expansive chef’s kitchen anchors the floor plan with an oversized granite island, custom cabinetry, and a walk-in pantry, opening directly into the family room and its gas fireplace. A formal dining room with coffered ceilings sits alongside a private living room currently used as a home office — the kind of separation that makes remote work and multi-generational living actually workable under one roof.

Primary Suite & Second Floor

Upstairs, the primary suite delivers a generous walk-in closet and a spa-inspired bath with a soaking tub and separate stall shower. Three additional bedrooms each offer walk-in closets, and a second-floor laundry room with custom cabinetry and a utility sink means no more hauling laundry between floors.

The Walk-Out Lower Level: A True Mother-Daughter Suite

This is what sets 1233 Poplar Avenue apart from most listings in Mountainside — a newly completed, 1,000-square-foot walk-out lower level built for genuine independence. It offers its own private entrance, 9-foot ceilings, a spacious recreation room, a custom wet bar, a full bathroom, and a guest bedroom with additional living space. Call it a mother-daughter suite, an in-law apartment, or au pair quarters — it functions as real, separate living space, not a finished basement with a couch in it.

Outdoor Living

Outside, the professionally landscaped, multi-level backyard makes full use of the 0.39-acre lot: a Trex composite deck overlooking a fully fenced yard, a paver patio, and an expansive lawn give you distinct zones for dining, entertaining, and play. An oversized two-car attached garage with custom mudroom storage rounds out the property.

Features at a Glance

5 bedrooms, 3.5 bathrooms (3 full + 1 half) across three finished levels
4,000+ total square feet, including a 1,000 sq ft finished walk-out lower level
Two-story foyer with custom wainscoting and millwork
Chef’s kitchen: oversized granite island, custom cabinetry, walk-in pantry
Family room with gas fireplace, open to the kitchen
Formal dining room with coffered ceilings; private living room / home office
Primary suite with walk-in closet and spa-inspired bath
Second-floor laundry room with custom cabinetry and utility sink
Mother-daughter / in-law suite: private entrance, 9-ft ceilings, wet bar, full bath, bedroom
Trex composite deck, paver patio, fully fenced 0.39-acre lot
Oversized 2-car attached garage with custom mudroom storage
Built 2015; lower level newly finished
Estimated annual property taxes: approximately $17,923

Location, Schools, Commute & Lifestyle

Schools

1233 Poplar Avenue is zoned for Deerfield Elementary School (grades 3–8) in the Mountainside School District, about 0.3 miles from the home. Younger students attend Beechwood School (PK–2), roughly 1.1 miles away, and high schoolers attend Governor Livingston High School in neighboring Berkeley Heights. Buyers should independently verify school assignment and district boundaries.

Commute

Mountainside offers direct NJ Transit bus service to the Port Authority Bus Terminal in Manhattan, with a stop at Route 22 near Borough Hall. Drivers get quick access to Route 22 and I-78, connecting to Newark, Jersey City, and Newark Liberty International Airport in roughly 20–25 minutes. Downtown Westfield’s NJ Transit rail station, with direct service to NY Penn Station, is also just minutes away — giving commuters a choice of bus or rail.

Lifestyle & Parks

Mountainside sits next to two of Union County’s best outdoor spaces: Echo Lake Park, a 139-acre county park with two lakes, ball fields, playgrounds, and a summer concert series, and the Watchung Reservation, 2,000 wooded acres with more than 13 miles of trails and the Trailside Nature and Science Center & Planetarium. The borough also runs its own Community Pool and fitness trail, and downtown Westfield — shops, restaurants, NJ Transit — is a short drive away.

Who This Home Is Perfect For

Multi-generational families who want a true mother-daughter or in-law suite with a private entrance
Buyers hoping to give extended family, aging parents, or an au pair genuinely independent living space
Growing families who need 5 bedrooms plus flexible bonus space — home office, rec room, guest suite
Commuters who want NYC access without giving up a spacious, suburban lot
Buyers who want a newer-construction Colonial (built 2015) with move-in-ready systems
Anyone who entertains regularly — the kitchen, backyard, and lower-level wet bar are built for it

Frequently Asked Questions

What is the price of 1233 Poplar Avenue in Mountainside, NJ?
It’s listed at $1,825,000.

Does 1233 Poplar Avenue have a mother-daughter or in-law suite?
Yes — the newly finished, 1,000-square-foot walk-out lower level has its own private entrance, full bathroom, bedroom, wet bar, and living space.

How many bedrooms and bathrooms does 1233 Poplar Avenue have?
5 bedrooms and 3.5 bathrooms (3 full baths and 1 half bath).

What is the total square footage of 1233 Poplar Avenue?
More than 4,000 square feet across three finished levels, including the 1,000-square-foot lower level.

What school district is 1233 Poplar Avenue in?
The home is zoned for the Mountainside School District, including Deerfield Elementary School. Buyers should confirm current zoning independently.

What is the commute like from Mountainside, NJ to New York City?
You can take NJ Transit bus service directly to the Port Authority Bus Terminal, drive via Route 22/I-78, or use the NJ Transit rail station in nearby downtown Westfield.

Is 1233 Poplar Avenue good for multi-generational living?
Yes — the walk-out lower level functions as genuinely independent living space, ideal for extended family, aging parents, or au pair quarters.

What year was 1233 Poplar Avenue built?
2015, with the lower level newly finished.

What parks and recreation are near 1233 Poplar Avenue?
Echo Lake Park and the Watchung Reservation are both minutes away, along with Mountainside’s Community Pool and fitness trail.

What are the annual property taxes on 1233 Poplar Avenue?
Estimated at approximately $17,923 per year.

Schedule a Private Showing

Want to see the mother-daughter suite in person? Reach out and we’ll set up a private showing of 1233 Poplar Avenue.

Galina Kaplan · REALTOR® Associate · The Corcoran Group · 908-379-0737
Co-listed with Marina Fridman Rybner, The Corcoran Group · MLS #4039351, GSMLS