I think I found a reference to Frasier in last nights show, "Heat". One of the delivery guys mentions delivering a package of pornography to a place on Euclid St. In an episode of Frasier, the episode where he tried to plan a bachelor party for Daphnie's fiancee`, Frasier had an incident involving Pornography on Euclid.

Also, in the last shot of Max on the space needle. I saw a gray blockish building which is very similar to a building seen through Frasier's window. Is this some Seattle landmark, or just and odd coincidence?

If Euclid is a real street, why would it be a Frasier reference? It'd only be a Frasier reference if it's a fictional stree that that show created.

It's a Frasier reference because on Frasier there was an incident involving porn on Euclid street. Dark Angel referenced it by having someone deliver a package of porn to Euclid street. The street isn't the reference, the incident is.

There is a Euclid Street in Seattle & my source said that it is in the part of town where they have Adults Only shops.

Therefore we have an instance of the Frasier writers actually doing their homework.

I'm shocked. Shocked I tell you. Normally the Seattle of Frasier bears little resemblance to the real Seattle.
(Was the Frasier ep written by Ken Levine? He used to work as a Seattle Mariners' announcer &, I believe, was the only person involved in Frasier who had even set foot in the town before the show's 100th episode.)