Working nights as a security guard for a bank

He has been working for one of the banks for a period of ten years, and he [recently] learnt that working for banks is not permissible. He works nights as a [security] guard, and has no connection with the [trading] activities [of the bank], so can he continue working [there] or [should he] leave?

Renting a trading establishment to a bank which deals with ribaa

I own [some] stores located on al-Hijaaz Road, and the National Bank has offered to rent them; [so] since this bank is amongst those banks which deal with ribaa, would it be permissible for me to rent [these stores] to this bank and those like it which deal with ribaa? Please provide us with a fatwa, and may Allaah reward you [well].