Shared ownership properties, such as flats in tenements in Scotland and the UK (known as condominium ownership in the US, I think) require buildings insurance, as a fire or other damage to the fabric will affect other parts of the property.

This is codified in law by parliament as the Tenements (Scotland) Act 2004, Section 18, Obligation of owner to insure - http://www.legislation.gov.uk/asp/2004/11/section/18