tax liability

In December 20X5, Mighty IT Co revalued its corporate headquarters. Prior to the revaluation, the carrying amount of the
building was $2m and it was revalued to $2·5m.
Mighty IT Co also revalued a sales office on the same date. The office had been purchased for $500,000 earlier in the
year, but subsequent discovery of defects reduced its value to $400,000. No depreciation had been charged on the sales
office and any impairment loss is allowable for tax purposes.
Mighty It Co’s income tax rate is 30%.

thanks for your previous help mike

can u just tell me what is the carrying value, tax base and taxable difference of the sale office pls