Bad Survey Report- what is reasonable?

[Jeremy Segermeister]

I’m in escrow on a lot to build my dream home. I live in the Bay Area, so everything is relative.

The listing and disclosures had the lot size as 73’ wide by 120’ deep, at 7,854 square feet. We landed at $990k purchase price.

I spent the money to have the lot surveyed and hired an architect. The surveyor found out that the lot is actually 63’ feet wide and 7595.92sqft.

I feel like this is a material change and I should ask for a reduction. What would be a fair way to calculate the reduction? Cost per sqft?