The building centralises services for the two regions into one new facility on East Clyde Street in Helensburgh.
The project involved refurbishing the Grade B listed former Clyde Street School building and building a new extension alongside it.
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Features of the upgraded building include new community spaces, a cafe, a marriage suite, a gallery and meeting rooms.
Outside, there will be landscaped grounds open for public use with an outdoor events and marriage area along with a community garden.
Approximately 140 council staff will be located in the extension building.
Work started on the project in August 2013.
Members of the public are invited into the building between 2.30pm and 4.30pm on Friday, 27 November.
(LM/CD)
