Ms Lamond described the School of Art building as a "real local landmark" that people were very sad at losing.
"The School of Art has had fantastic students who have gone on to international success and who have talked very fondly about the school," she said.
"So it'll be a sad day when it does start being knocked down."
The UCU branch chair also said the demolition would be a huge undertaking that would cause disruption due to its proximity to a junction on the ring road.
In 2022, a slew of courses within the school of arts closed due to a financial deficit at the university, but "lots of arts courses" were still being taught inside the building, she added.
"We know things have to change, the university has too much estate," Ms Lamond said.
"We know we can't say don't change anything, but it's disappointing it's that building, with so much history. It's a landmark."