Automation Blocks - Set Start Frame

In my continuing quest to script a template, I've got a variable start frame from the client's lineup sheet. (This shot starts on 1001, this shot starts on 1097, etc.) So I've been trying various ways of setting the Comp's Start Frame via script. My template is set to 1000.

...but I'd like to change it to (in this example) 1016 or some other number.

For the life of me, I can not find it in the set attributes block of Ae Comp (work area start, display start frame, display start time, work area start), or Ae Project Items (time).

To paraphrase C-3PO on the Death Star, "Where could it be?"