Okla. Stat. tit. 11, § 11-47-121: Building line ordinance

After any plan for major streets, or portions thereof, has been

prepared and adopted by a city planning commission, the council

shall be authorized and empowered to establish, regulate and limit

building or setback lines on such major streets by ordinance and to

prohibit any new building being located within the building or

setback lines, and to amend such regulations from time to time.