assess at
To estimate the value of something at a particular price. A noun or pronoun can be used between "assess" and "at." What price has the house been assessed at? I'm thrilled that the expert assessed my family heirloom at such a high price.
assess something at something
to estimate or value something at some figure. They assess the value of our house at half what it would sell for. The house was assessed at far more than its true worth.