Apartment lease income question?

I am just under the 3x income requirement for my apartment rental application, however if I add in my self employment as secondary supplement income along with my salary job it would bring me where I need to be. My past 2 years of tax return from Schedule C self employed are different amounts, so how do they determine if that satisfies the income requirement? Do they take the lower of the 2 years to safely say I can make X amount, or do they take the average earnings from both years combined?

Apartment lease income question?
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