Additional asbestos located at one of the Nashua Millyard buildings, known as the Boiler House will delay the building’s demolition at an additional cost to the city, officials said this week.

Crews from NCM Demolition and Remediation began dismantling the Boiler House last month at the Nashua Millyard, found an additional ring of asbestos in the roof area, forcing them to delay the work while they re-worked the asbestos abatement plan with state environmental officials.

Initially, crews expected to complete the demolition project by the end of April, but the additional asbestos may now delay it into the end of June. The Boiler House sits in the path where the Broad Street Parkway will feed into Millyard Technology Park.