Help Please. Sold rental and want to go over what the depreciation recapture should be

 I purchased a  rental house 20 years ago. That year I added it to TT as an asset. Since then I added about 20 assets as improvements amounting to about $30,000. Most of those assets have already been fully depreciated;

meaning their 'life' ended years ago. I thought I read if they were fully depreciated they are not recaptured at time of sale.  The program says I must recapture about  $100,000 depreciation which seems very high. Any suggestions please?  Some more facts if relevant.  TT put the sale on schedule D and called it 1250 property. 
TT put the basis and depreciation on form 4797. I am adjusting the basis with $20,000 sales costs including commissions.