The IRS requires that you claim all depreciation that you are allowed and it must be entered in the spot you are asking about. If the house was rented for 7 years, the dates of rental need to reflect 7 years. If it was a rental for 10 years and you just didn't take the depreciation, it needs to be the 10 year number. If you failed to claim depreciation in prior years, you can amend the last 3 years. Otherwise, you can file form 3115 with your tax return to ask for the missing depreciation.
See About Form 3115, Application for Change in Accounting
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