451 avenue Mountain vs 456 avenue Mountain
Data as of October 29, 2026 · updated every week
451 avenue Mountain is the older building (1850); 456 avenue Mountain was built in 1902. 456 avenue Mountain is assessed at $2,519,000, 21% more than 451 avenue Mountain ($2,076,800). Neither has a building permit on record. Neither is in a flood zone.
| 451 avenue Mountain | 456 avenue Mountain | |
|---|---|---|
| Type | House or building | House or building |
| City and borough | Westmount | Westmount |
| Built | ≈ 1850 | 1902 |
| Assessed (roll) | $2,076,800 | $2,519,000 |
| Since the previous roll | +11 % | +8 % |
| Welcome tax on that value | ≈ $29,263 | ≈ $35,896 |
| Lot | 337 m² | 340 m² |
| Floor area | 215 m² | 267 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 | 1 Note | 1 Note |
| Nearest metro | Atwater, 780 m | Atwater, 810 m |
The full report for each address explains every finding and shows the full permit and value history.
Full report: 451 avenue Mountain Full report: 456 avenue Mountain