A rare opportunity to own a distinguished estate on prestigious Arnold Avenue in the heart of Prime Old Thornhill. Set on an exceptional 100 x 160 ft lot, this stately stone-front two-storey residence offers 5 spacious bedrooms, 9 washrooms, soaring ceilings, and an abundance of natural light. Multiple skylights enhance the bright, elegant interior, while expansive principal rooms are designed for refined family living and grand entertaining. A 3-car garage, circular interlocked driveway, and secondary service entrance add exceptional functionality. The private, sun-filled backyard creates a serene setting with outstanding privacy. Nestled on one of Thornhill's most prestigious streets, this remarkable estate offers timeless elegance in an unrivalled location.
About this home
Photos of 166 Arnold Avenue
Facts and features of 166 Arnold Avenue
| Type | Detached |
|---|---|
| Style | 2-Storey |
| Bedrooms | 5 + 1 |
| Bathrooms | 9 |
| Size | 5000 + sq ft |
| Lot | 100.36 x 159.74 Feet |
| Parking | 11 |
| Garage | Attached |
| Heating | Forced Air |
| Cooling | Central Air |
| Basement | Finished, Finished with Walk-Out |
| Exterior | Stone |
| Taxes | $20,149 (2025) |
| Days on market | 7 |
| Listing brokerage | RE/MAX REALTRON REALTY INC. |
Rooms
12 rooms, with sizes
| Room | Level | Size | Features |
|---|---|---|---|
| Library | Main | 13′ 3″ × 16′ 0″ 4.05 × 4.88 m | hardwood floor, french doors |
| Kitchen | Main | 16′ 1″ × 14′ 10″ 4.9 × 4.51 m | granite floor, modern kitchen, breakfast area |
| Primary Bedroom | Second | 18′ 8″ × 15′ 1″ 5.7 × 4.6 m | hardwood floor, 6 pc ensuite, walk-in closet(s) |
| Living Room | Main | 13′ 9″ × 21′ 8″ 4.2 × 6.61 m | hardwood floor, bay window, sunken room |
| Kitchen | Basement | 0′ 0″ × 0′ 0″ 0.0 × 0.0 m | Laminate |
| Dining Room | Main | 13′ 9″ × 21′ 1″ 4.2 × 6.43 m | hardwood floor, glass block window, pot lights |
| Bedroom 2 | Second | 13′ 9″ × 14′ 6″ 4.2 × 4.42 m | hardwood floor, 4 pc ensuite, w/o to sundeck |
| Recreation | Basement | 20′ 0″ × 20′ 0″ 6.09 × 6.09 m | laminate, sauna |
| Bedroom 3 | Second | 20′ 11″ × 19′ 9″ 6.37 × 6.03 m | hardwood floor, 4 pc ensuite, walk-in closet(s) |
| Bedroom | Basement | 0′ 0″ × 0′ 0″ 0.0 × 0.0 m | Laminate |
| Family Room | Main | 18′ 11″ × 19′ 10″ 5.76 × 6.04 m | hardwood floor, walk-out, marble fireplace |
| Breakfast | Main | 14′ 6″ × 19′ 7″ 4.42 × 5.97 m | Granite Floor |
Around this home
What’s near 166 Arnold Avenue
From 166 Arnold Avenue, the nearest TDSB elementary school is Pleasant Public School, about 2.1 km away.
Schools
- Pleasant Public School TDSB elementary · JK-5 EQAO 2024-25: Gr 6 reading 88% · Gr 6 math 44% about 2.1 km
- Lillian Public School TDSB elementary · JK-5 EQAO 2024-25: Gr 3 reading 71% about 2.6 km
- Fisherville Senior Public School TDSB middle school · 6-8 about 2.7 km
- St Paschal Baylon Catholic School Catholic elementary · JK-8 EQAO 2024-25: Gr 6 reading 95% · Gr 6 math 52% about 2.0 km
- Newtonbrook Secondary School TDSB secondary · 9-12 EQAO 2024-25: Gr 9 math 39% · Gr 10 literacy 98% about 2.0 km
- Brebeuf College School Catholic secondary · 9-12 EQAO 2024-25: Gr 9 math 80% · Gr 10 literacy 79% about 3.0 km
Nearest schools, not necessarily the ones that serve this address. Check with the TDSB and TCDSB school locators.
Places: OpenStreetMap contributors, October 2026. Straight-line distances. Schools: EQAO 2024-25, Ontario Ministry of Education.
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166 Arnold Avenue
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166 Arnold Avenue
Listing information is deemed reliable but is not guaranteed accurate by PropTx or the Toronto Regional Real Estate Board. Data source: PropTx. Listings are refreshed from the MLS® at least daily.
The information provided herein must only be used by consumers that have a bona fide interest in the purchase, sale, or lease of real estate and may not be used for any commercial purpose or any other purpose.
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MLS® N14108462 Data source: PropTx Listed October 22, 2026
