when it comes to 24 hrs parking, fee gets expensive. Could you check with the parking building behind QNB bank on corniche.

https://www.google.com.qa/maps/place/City+Commercial+Centre/@25.2892945,51.5379157,18z/data=!4m2!3m1!1s0x0000000000000000:0x2b4caa25588f413e?hl=en