Then. Gerhard Heintzman's House. Bloor Street East. Not sure of the date — 1910-ish?
Now. June 2012. There is a condo here now. At 300 Bloor Street East.
Bonus pictures: hey, I used to be in Biz development :) An aerial. You can make out the house; it's the second to the left/west of the fresh cut for the Mt. Pleasant Rd. extension.
And finally, to clinch your customer loyalty, another picture of the House here.