Thank you all who weighed in.

TL; dr: I retract my request.

Yesterday heard back from Highline Heritage Museum. The area I’ve known for decades as Boulevard Park only took the name Boulevard Park in 1937. From 1909 to 1937, a portion of Boulevard Park (of the greater area Boulevard Park-Riverton) was known as Southern Heights. 

While using the name Boulevard Park makes sense to me, local government prefers otherwise.

Thank you for reading.