The Graystone Ballroom was not in Paradise Valley.  It was located at Woodward and Canfield at 4237 Woodward.  It opened its doors in 1922, had two stages, and could hold about 3,000 people.  It was billed at the time as Detroit's million-dollar ballroom.  The Graystone at one point was segregated and Monday nights were when blacks could frequent the ballroom.  McKinney's Cotton Pickers was the in-house band for a number of years.  The Graystone was known for bringing in the finest big bands from around the country.