is donation to university accommodation bureau deductable from rental income ?

I wonder if anyone would care to comment?
I let a house through the local University Accommodation Bureau. Their se rvice is free but they invite donations to help cover their costs. They ad
vertise my property on their website (which only students can access) and t hey supply a standard fair rental contract template. But they play no part in the rental itself.
If I make such a voluntary donation to the University Accommodation Bureau, following a successful let, would it be deductible against the rental inco me?
The UAB is not a registered charity.
thank you for any guidance,
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