The Louis-Hyppolite Lafontaine House was built around 1845 for George Bourne, a brewer from La Prairie, and was likely designed by architect John Ostell. Louis-Hippolyte La Fontaine, Prime Minister of Canada East (1842–1843, 1848–1851), lived in the residence from 1849 until his death in 1864. The City of Montréal designated the house as a heritage property in 1988.
Situated in the heart of downtown Montréal, the house had endured years of neglect and a series of ill‑advised alterations. BMAA was tasked with reconstructing the exterior envelope based on a detailed historical study of the original building. The existing masonry was carefully dismantled, catalogued, and reassembled. Although the interior décor has not survived, the building has regained its presence and significance within the urban landscape.