Due to the fact that the life span of the building is missing from the information, only general statements can be made.
In general, buildings are depreciated over a 30 year period. If that period is used, then we can calculate an answer to the question as follows:
$528,000 - 325,000 ÷ 30 y ÷ 12mo/y = $1,467/mo
now that we have a monthly depreciation, we can calculate the time period necessary to reach $325,000, which is given by
$528,000 - 325,000 = $203,000; we then divide that number by the monthly depreciation to get ≅ 138 months
138 months divided by 12 mo/y ≅ 11.5 years
Granted, if the life span is some value other than 30, the results of the calculations will be different.