If you are hosting promotions and seminars this would not be rental income as it is not passive income, but it would be schedule C self-employment income.
You would be able to claim a prorated amount as a maintenance expense for the business compared to personal use. Ex. If you pay $900 for the 90 days, you would be able to deduct (14/90=) 15.6% of the $900 or $140.
You cannot deduct the entire amount only the amount that directly relates to your business.
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