Yes that is the third Wentworth County Courthouse which was built in 1877 and replaced in 1957 with the building now occupied by the McMaster Downtown Centre.
(picures of the 2nd courthouse 1829-1877 can be seen here
http://henleyshamilton1.wordpress.co...use-1829-1877/ )
Six portico columns were moved to White Chapel Cemetery and installed in the Temple Gardens section in 1957.
The cornerstone is at Westfield Heritage Village:
Westfield also owns a desk used by the Wentworth County Council which met in the courthouse. It is currently on loan to the Workers' Arts & Heritage Centre.
