A unique heritage residence with timeless charm Set in a remarkable natural environment in Mont-Saint-Hilaire, the Monast-Lahaise House stands as a true testament to Quebec's architectural heritage. Built in 1808 and listed in the province's cultural heritage register, this elegant detached two-storey home sits on over 65,800 sq. ft. of landscaped land bordered by a tranquil stream. The enchanting setting offers privacy, serenity, and a partial view of the mountain.