@johnkfarr
The sale of the rental property is a sale of two assets, (1) the land and (2) the structure and improvements built on the land. The land cannot be depreciated, the structure and the improvements can be depreciated.
If you reported the separate cost basis for the land and the improvements, then you must allocate the sales price and the cost of sales between the land and the improvements at the screen Sales Information.
The two sales are reported on IRS form 4797. The land sale is reported on page 1. The sale of the structure is reported on page 2. Note that Part III line 22 will report the recapture of the depreciation you have taken on the building since the rental asset was first reported. This recapture is reported as ordinary income and may account for the 'huge amount' that you saw.
See also this help.
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