Every read "Forbidden Archeology"?  Loaded with actual dig sites that date long before humanity was supposed to be bopping around  Momma Terra.  One was a mine that found stone tools under a lava flow that was a few million years old. Another was a metal sphere found in Africa. Basically a ball bearing with a ridge around the equator.  It carbon dated at over a  years old!

It just begs for a "those who came before" story arc.

The low rate of violent death in Ottawa makes it unlikely we have any numbers of Black court vampires or ghouls around, but that leaves a lot of options.  There is a fair amount of variation in the styles of various Red court vampires; Bianca left a trail of bodies, while Ortega was very controlled in the matter of feeding.  He kept deaths to a minimum and kept a captive community for his vassals to feed on.  If the city does have Reds they probably act in a similar way, confining their feeding to poorer areas of the city (Vanier? Hintonburg?) and using cash and threats to buy the silence of their blood supply.  Or if you prefer a darker route, and don't mind borrowing from White Wolf, they may have simply grabbed people no one would miss and keep them caged like battery hens someplace secret; maybe someplace outside of town off a side-road.  The Raith don't have to go to those lengths, their feeding is usually non-lethal and when they do kill it probably doesn't look like murder.

One thing I can say is that if this city had a supernatural presence, they would not be sloppy.  Ortega or Lara could survive here, Mavra or Bianca would likely cause too much disruption and draw too much notice.  Subtler actors and manipulators would find it easier to move about here, provided they were careful enough in cleaning up after themselves.

As far as a element of conflict goes, Ottawa weather suggests we may be a battleground for the Winter and Summer courts.  I doubt either of them is responsible for hushing up the fallout of those battles, besides weird and unseasonal heat waves and cold snaps, but that still leaves plenty of options for string-pullers.  A government organization could be a potential candidate there, but given powers of the vampires and the sidhe I find it unlikely that such a group could remain [1] hidden, and [2] uncorrupted.  

Oh man, that is so great. Fantastic. Thank you for the idea.