218 W19th according to google
http://maps.google.ca/maps?q=218+w+19th+...=0CAoQ2wU&sa=X&ei=x0GOT82PHcHAwAH6j63UDQ
My guess is it's a hydro Substation. Check out a similar building found here in Scarborough
Quote:
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A distribution substation in Scarborough, Ontario disguised as a house, complete with a driveway, front walk and a mown lawn and shrubs in the front yard. A warning notice can be clearly seen on the "front door".
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http://en.wikipedia.org/wiki/Electrical_substation