18 avenue Thornhill vs 21 avenue Thornhill
Data as of October 29, 2026 · updated every week
18 avenue Thornhill is the older building (1923); 21 avenue Thornhill was built in 1925. 21 avenue Thornhill is assessed at $2,862,400, 42% more than 18 avenue Thornhill ($2,015,300). Neither has a building permit on record. Neither is in a flood zone.
| 18 avenue Thornhill | 21 avenue Thornhill | |
|---|---|---|
| Type | House or building | House or building |
| City and borough | Westmount | Westmount |
| Built | 1923 | 1925 |
| Assessed (roll) | $2,015,300 | $2,862,400 |
| Since the previous roll | +8 % | +8 % |
| Welcome tax on that value | ≈ $28,340 | ≈ $41,047 |
| Lot | 283 m² | 416 m² |
| Floor area | 177 m² | 209 m² |
| Notice of deterioration | No | No |
| City’s right of first refusal | No | No |
| Heritage | No | No |
| In a flood zone | No | No |
| Building permits on record | 0 | 0 |
| Findings | 2 Note | 1 Note |
| Nearest metro | Atwater, 980 m | Atwater, 1.0 km |
The full report for each address explains every finding and shows the full permit and value history.
Full report: 18 avenue Thornhill Full report: 21 avenue Thornhill