The 15-story, contemporary glass and precast-concrete building will have parking for 150 cars on three lower levels.
The space dedicated to contemporary artistic glass has also been enlarged.
The Glass Museum houses a large collection of contemporary glass from all over the world.
In addition, the museum has a fine collection of contemporary glass and of ceramics from 1950 to the present.
The Museum's gallery of contemporary glass focuses on vessels, objects, sculptures, and installations made by international artists over the last 25 years.
"I kind of pooh-poohed the idea of contemporary glass," he explained.
The institution is the only facility completely dedicated to contemporary glass.
And it is the nation's only museum that shows primarily contemporary glass.
The museum, for its part, decided to widen its focus even more, beyond contemporary glass.
Nor should worrying about what could happen to a well-tended collection of contemporary glass.