It will probably not be of much utility (depending) but do you have your title insurance policy?
You will most likely be able to reconstruct the deductions you took (or would have been able to take) with respect to your home office. Regardless, the IRS is not going to have records going that far back.
If you don't know which lender you used, nor the closing agent, there's little hope of getting a closing statement from 1993.
