Specially designed windows were smashed at a construction site in Arbroath over the weekend.
Police have appealed for witnesses to the incident, which took place at Baltic Mill, Dens Road, Arbroath, between 3.30pm on March 6 and 8am on March 8.
A total of 10 windows, which have been described as having a “specialist bespoke design”, were broken.
They have an estimated value of more than £4,000.
Witness are asked to contact police on 101, quoting reference number 1265 of March 8.