To add to that, I had friends/colleagues from downtown and north york who submitted applications and both were processed at Scarborough.If your residence is in the west end or surrounding areas the LVO would most likely be Mississauga. If you live closer to the east end then it would be Scarborough. That being said these two centres often share work load depending on their capacity.
It wont hurt to give them a call and ask, the call centre staff should be able to see which office your file is transferred to.