A Vancouver architecture firm is urging city council to protect what is believed to be the oldest planted deciduous tree in Vancouver by giving it a heritage designation.

Bing Thom, founder of Bing Thom Architects, said in a release that the 100-year-old, 120-foot-tall tulip tree is a "striking landmark" in the city's West End and "one of the finest specimens of its type."

"It is certainly one of the tallest deciduous trees in the region," he said.

Thom wants the tulip tree declared a heritage site so it won't be cut down for any future projects, but the proposal could prove tricky because the tree has extended its roots and canopy into an adjacent property.

The city is looking at ways to preserve the tree, and will vote on the issue this week.