Hra claim with out pan

Take declaration from Landlord along with his address proof to that effect, and submit it along with rent receipt.

That is minimum requirement to claim HRA vide Circular no.: 8/2013 dated 10/10/2013

Thank you for your response. I did the same last year. But this year my office is not ready to accept this. Is it possible to claim HRA directly to IT dept somehow ?

Without any evidence, (at least payment by cheque every month in the name of landlord), it may get disallowed. Still you may try to claim.