Union County and Mountainside Borough property records for 16 addresses on Hillside Ave, Mountainside, NJ · Last verified August 2026
| Properties | 16 |
|---|---|
| Median Sale Price | $1,100,000 |
| Deeds and Mortgages on File | 14 |
| Median Price per Sqft | $316 |
| Owner Occupied | 75% |
| Median Annual Tax Bill | $15,198 |
| Median Year Built | 1950 |
| Median Ownership Tenure | 8 years |
Owner names and prior sale amounts shown locked below are available instantly with a free trial.
4,861 sqft · Built 1880 · 1.51 acres · Garage
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $1,540,000Aug 2021 | $30,0722025 | Amount on Record Mar 1999 | 2 Names on Record Owner Occupied | Assessor + 1 DocumentUpdated Jul 2026 |
4,590 sqft · Built 1974 · 0.894 acres
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $1,850,000Jan 2024 | $27,8612025 | Amount on Record Apr 2022 | 2 Names on Record Owner Occupied | Assessor + 5 DocumentsUpdated Jul 2026 |
12,224 sqft · Built 2010 · 3.06 acres · Garage
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $1,150,000Jul 2008 | $61,5592025 | 2 Names on Record | Assessor + 1 DocumentUpdated Jul 2026 |
2,690 sqft · Built 1957 · 0.462 acres · Garage
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $905,000Aug 2018 | $16,4492025 | 2 Names on Record Owner Occupied | Assessor + 1 DocumentUpdated Jul 2026 |
2,872 sqft · Built 1950 · 0.433 acres · Garage
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $1,100,000Nov 2025 | $14,6832025 | Amount on Record Jun 2015 | 1 Name on Record | Assessor + 1 DocumentUpdated Aug 2026 |
3,314 sqft · Built 1750 · 0.623 acres · Garage
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $17,7982025 | 2 Names on Record Owner Occupied | AssessorUpdated Jul 2026 |
2,618 sqft · Built 1948 · 0.328 acres · Garage
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $810,000Dec 2023 | $13,1592025 | —Feb 2002 | 1 Name on Record Owner Occupied | Assessor + 1 DocumentUpdated Jul 2026 |
2,617 sqft · Built 1945 · 0.326 acres · Garage
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $800,000Oct 2022 | $15,1982025 | 2 Names on Record Owner Occupied | Assessor + 1 DocumentUpdated Jul 2026 |
3,513 sqft · Built 1940 · 0.367 acres · Garage
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $865,000Aug 2005 | $18,5122025 | 1 Name on Record Owner Occupied | AssessorUpdated Jul 2026 |
2,907 sqft · Built 1939 · 0.323 acres · Garage
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $890,000Jan 2007 | $15,6532025 | Amount on Record Apr 2003 | 2 Names on Record Owner Occupied | AssessorUpdated Jul 2026 |
2,293 sqft · Built 1981 · 0.267 acres
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $552,500Dec 2019 | $12,5812025 | 2 Names on Record Owner Occupied | Assessor + 1 DocumentUpdated Jul 2026 |
0.317 acres
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| —Mar 2015 | $1282025 | 2 Names on Record | AssessorUpdated Jul 2026 |
1,821 sqft · Built 1952 · 0.303 acres · Garage
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $538,000Jun 2007 | $11,3252025 | 1 Name on Record | AssessorUpdated Jul 2026 |
1,543 sqft · Built 1951 · 0.228 acres · Garage
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $170,000Feb 1999 | $11,1222025 | 2 Names on Record Owner Occupied | AssessorUpdated Jul 2026 |
2,457 sqft · Built 1920 · 0.325 acres · Garage
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| —May 2003 | $13,1822025 | 1 Name on Record Owner Occupied | Assessor + 1 DocumentUpdated Jul 2026 |
2,146 sqft · Built 1955 · 0.203 acres · Garage
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| —Dec 2020 | $13,1822025 | Amount on Record Sep 2014 | 2 Names on Record Owner Occupied | Assessor + 1 DocumentUpdated Jul 2026 |