Not in atti mode. If you are close enough to the ground and enough light for vision positioning the OA sensors should work but not in atti mode.
In an 850k sqft warehouse that actually might be fun especially if they don’t have really tall shelving throughout the core. That’s where that
DJI FPV drone might excel.
You might have more issues with low light though. Those warehouse buildings are usually pretty dimly lit. Usually they’ll have a lift at most warehouses and you could see if they’ll let you get up on one of those and fly from there so you can get a better view of the drone while flying around.