You can send your passport to Ottawa. One of the options in my PPR was to send it to Ottawa:
"If you have a mailing address in Canada and if you and all the accompanying dependents on your application are currently in Canada and plan to be in Canada for at least three months, you may submit your passport(s) to the Case Processing Centre – Ottawa.
You are required to send your document(s) together along with a copy of this letter by mail or courier to the following address with the additional following document:
A self-addressed, pre-paid Xpresspost envelope from Canada Post."