Using the same architects as his brother, Andrew Allan built Iononteh, a greystone mansion completed in 1865 that dominated Upper Peel Street, but which has since been demolished.

[2] In 1894, they commissioned the architect Edward Maxwell to build them a house on the land gifted to them by Mrs. Meredith's father on Pine Avenue, at the corner of Upper Peel Street.

Originally, the grounds included three levels of terraces, rosebeds, perennials, climbing vines and a kitchen garden, which have all now been replaced by a car park, as was the wrought iron gate in the style of Georgian Dublin.

The two open-air verandas at the rear of the house, that gave uninterrupted views down over Montreal, the St. Lawrence River and onto the Green Mountains of Vermont, were filled in with windows sometime after 1941.

In 1987, the house was described by Francois Remillard in his book Mansions of the Golden Square Mile, Montreal 1850-1930: This is one of Edward Maxwell's most successful designs.

With its towers, stepped windows and high chimneys Lady Meredith House befits the dramatic landscape of the slopes of Mount Royal.