Yes for communication purpose it is necessary to have a valid registered office address. Registered office can be any commercial place, residential building etc.For Registered office of PRIVATE LIMITED COMPANY, any utility bill depicting the address will be sufficient if it will be in the name of any proposed Director or if the concerned place is rented or leased then the lease aggrement or rent aggrement along with its any utility bill depicting the address and NOC from the Landlord will be required.