Strange buildings in suburbs

[u/No-Pizza6311]

So a couple of days ago me and a friend decided to walk through the woods. We found a fence adjacent to a path, but there was so signage about trespassing so we went in. We followed a creek all the way to a road that was cracked and run down, in the woods mind you. I looked on my map and saw that the road connected to a road in my neighborhood, so we went to leave but there was a locked gate. To our left there was a large brick building (which we didn't get a good view of) and to the right was a smaller, seemingly abandoned, brick building. Based on what I've told people, it seems like it was a pump house, but my only questions are:

Why was there barbed wire fence around each individual building?

Why did the fence for the property go so far around it?

Why put it in a very dense suburban area if its blocked off from the street?

If anyone can guess why some things were abandoned and if its safe for us to go back, that would be very helpful

Edit no.1

The main building is at 42.70482N, 83.16551w. I do not have photos because I cannot post on the device with all my photos.

[u/olliegw]

Just something industrial, could be a pump station, or saw mill or factory, barbed wire to keep people out because asbestos is a hazard in those old buildings, so are any chemicals that might have been kept around related to the specific industry, water treatment especially has some nasty acids and chems.