According to old brochures, 4400 60th Ave. North, St. Petersburg, FL, which is--more or less--in the middle of Pinellas county. I'm pretty sure that they were located in Pinellas county back in the day, and not on the Tampa side of the bay.
Hmmm... Just found another brochure that lists the address as 6101 45th St. North, St. Petersburg. That's in the same general area as the address above.
And then finally one that says sales offices at 101 16th Ave. South, St. Petersburg, which is down by Salt Creek.
So, I guess, take your pick. But for my money, I'm pretty sure the address near the intersection of 60th Ave. N and 45th St. N. is where the old production facilities were.