The expenses you pay on behalf of your customers, would not be your expenses for your tax return. They are the customers rental expenses. That is more of a bookkeeping issue than a tax one.
The only income you need to report on your own return and pay taxes on, are your fees/commissions that your clients pay you. Your business expenses would be any of those incurred while conducting your business. Examples might include:
Advertising, office expenses, licenses, rent or lease payments you make on your office, mortgage interest if you own the property, insurance, vehicle expenses, etc.
https://www.inman.com/2012/02/10/tax-reporting-tips-property-managers/
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