Are you sure that it is 150 feet up? It looks only like 100 feet to me. They do make manlifts that would reach that, in your picture there is plenty of room, maybe not all around the facility.
Without pictures of all the landscaping it is hard to be sure.
If there really is no access for manlifts then you have a few options.
1. Hire a window cleaner and have him repel and clean as he goes down.
2. Use a roof roller so when he repels, you can move him side to side.
3. Use a swing stage, you can clean about 20-30 feet wide then move it over.
4. Use a crane with a basket, run lots of hose and have the crane move you into position and side to side with radio or hand signalling, this would be the fastest but the most expensive. You would have to get more pictures and go talk to them and explain what you want to do.
With the crane, you can clean probably 100 feet on each side before moving the crane, depending on how tall of a crane you can get.
Let us know what you decide and get pictures or video of you doing the job.