one issue is that there are many different methods used by assessors across the country. so we really have no way of knowing if that $75K would be proper to subtract from the cost or use 47% for the structure. it could be land is assessed at A% of Fair Market Value with rate B while the structure is valued at C% of Fair Market Value with rate D.
if land and structure are being assessed differently then a 53%/47% split would not be appropriate.
you do have the option of hiring an appraiser to give you valuations based on the date you purchase it,
note that the iRS, if you are audited, could challenge this. but if the appraiser does their job fairly, you have a good chance of prevailing.
