House size is 575 sqft smaller in the appraisal

[Andy Wu]

I am purchasing a investment property. The auditor website and list says 3005 sqft. The house is 5 split level with the lowest level unfinished. 

The appraisal report comes with 2430 sqft Gross living area. 397 sqft finished basement and 140 sqft non-living finished area (due to the wall of one bedroom is not high enough). 

I supposed to  close it next week. I want the seller reduce the price, but seller do not agree. What should I do?