trading for depreciation

[Max Zappas]

Would it be wise to sell an asset and 1031 exchange once you've taken the bulk of the depreciation on it? For example, we purchased a portfolio of 142 units and about 20-30% of the purchase price was able to be taken in 5, 7, and 15 year items as a tax write off. If, after 15 years, 20-30% of the value is no longer able to be taken in depreciation, then, wouldn't it be logical to sell so you could get a new asset with new depreciation?