It’s one of those ‘will build to suit’ developer things. They show a pretty pic on the RE billboard: a building that has been tentatively approved of by the city building dept.
The outside is completed to meet the code requirements (FARs, setbacks, access, parking, mechanical, utility, landscape, etc.), while the non load bearing interior walls are constructed according the buyer/leasor needs. They do this to reduce approval times and speed up the ROI.