Exteriors of the new ETFO building at the corner of Isabella and Huntley Sts. (Craig Robertson/QMI Agency)

TORONTO - As elementary school teachers prepare to strike next month, the union that represents them is putting the finishing touches on its new state-of-the-art headquarters set to open in the spring.

The four-storey, 7,750-square-metre building at the corner of Huntley and Isabella Sts. exudes green technology and modern design from KPMB Architects and with it comes a presumably hefty price tag -- though the the Elementary Teachers’ Federation of Ontario isn’t saying how much.