What you want to do is try and apply for the new housing rental rebate instead. But in order to do that you have to meet a number of conditions. At a minimum, I believe you have to show a one year lease of the property after you acquired ownership.
Here's the form:
http://www.cra-arc.gc.ca/E/pbg/gf/gst524/gst524-08e.pdf
But... I hate to break it to you...
Quote:
Filing deadline for application type 6
If you are a purchaser/landlord, you have to file the rebate
application within two years after the end of the month in which tax first becomes payable on your purchase.
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From: http://www.cra-arc.gc.ca/E/pub/gp/rc4231/rc4231-08e.pdf
I believe yours would be a Type 6 Application, and I think that means you're hooped.
The standard new housing rebate (Form GST 190) is only applicable if you are using the property as a residence or a family member of yours is and that was the first use after purchasing the property. I frankly don't understand why the government made the distinction between the two, as it basically becomes an extra hiden investment tax.