Exactly what is it that you are trying to price? Are you wanting to build something? Or are you just trying to figure out how much a home with x number of square feet will cost in the summer?
Also, no one knows what is going to happen in this market - prices may stabilize, drop or increase! We will not know for sure until that time comes!
All these agents are correct in respectfully correcting you. It is not a "same as" scenario, all homes are different. Just consider a great big drop to continue through next summer..