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Most landlords use Sch E but sch C is required sometimes. Topic no. 414, Rental income and expenses states: 

• if you provide substantial services that are primarily for your tenant's convenience, report your income and expenses on Schedule C (Form 1040), Profit or Loss From Business (Sole Proprietorship).
• Report income and expenses related to personal property rentals on Schedule C (Form 1040) PDF, if you're in the business of renting personal property.

@jimro