Van Horne hired
Bruce Price's architectural firm, who had done much of the work for the
Canadian Pacific Railway, to enlarge the old Hamilton's Italianate house to fifty-two rooms. Hamilton had hired architect
John William Hopkins (also with Daniel Berkley Wily) and was completed in 1869. It was Edward Colonna (died 1948), an architect who had previously worked for
Louis Comfort Tiffany before being hired by Price, who carried out the alterations to the Van Horne house. Colonna redid the entire ground floor and possibly much of the first floor, creating a spacious area with well-proportioned rooms and plenty of wall-space for Van Horne's art collection. The interior of Van Horne's house, from its fireplaces, ceilings and
gold leaf walls, was the first example of
Art Nouveau in
Canada. Van Horne claimed to like homes "big and bulky like myself", but he had one of the best private art and pottery collections in
North America and wanted a house he could share with it. The building was damaged by a fire on Monday, April 3, 1933, which led to the loss of part of Van Horne's private art collection. ==Van Horne Art Collection==