I didn't agree with mine so I got a private valuation done for €60, sent this to the council who after two phoen calls agreed to send out their surveyor. The market value was then dropped and the clawback reduced based on their surveyors report. I tried to get it lowered further but they said my choice was take it or leave it. I really want the apt as it is the perfect location which I could never even close to afford on the private market so I am taking it!