gsjansen, thanks for your reply. The annotated panoramic view is great, very interesting.
Here are a couple photos of the United portion of United/Western. United was actually Bill Putnam's first studio acquisition in Hollywood and plenty of huge hits were recorded there too, many personally engineered by Mr. Putnam (Sinatra, Ray Charles, Bing Crosby...).
During my time in the 70's I was a technical assistant on a Michael Jackson album at 6050. He was very kind to everyone and I recall him walking down Sunset to Arby's Roast Beef, to buy sandwiches for everyone.
In the 30's, way before Bill Putnam came along, 6050 as Horsley Studios. Horsley and Christie were two or the earliest film studios in Hollywood. Here is a photo of Horsley (from me) and a modern street view from Google. 6050 is now Ocean Way, a very busy and prestigious recording facility.