As to your specific question, I don't know what's going on in Vancouver, so hopefully somebody will chime in here, but I can tell you that a fixed percentage off ask price cannot effectively be applied across the board. Without knowing if the property in question if priced right to begin with, it is impossible to say whether or not 10-15% would be lowball, just right, or heck - even too much!
Put your head together with an area Realtor who can present you with solid "sold" comps, and formulate an offer based on what is happening right now in the neighborhood.
Good luck to you!
So, don't be shy to make an offer. The interest rates have dropped at or below 5.375%. HUD is offering special incentives for buyers and the Ohio Bond Program is offering downpayment assistance for first time buyers. Take advantage of the low home prices and the awesome interest rates. This is a buyers market and it won't last!
Please feel free to contact me if you have further questions.
Christie Peyton, Remax Result Plus