Sewer vent in my front yard

Hi,

I moved into a condo some months ago with a large sewer vent pipe in the middle of the front yard. I had one plumber tell me it was safe to cap it, but I'd definitely like to get a second opinion before I cut it. According to my condo neighbors, it has been there since the building was built and it's at least 5-6 feet down from the top of it to the sewer line. I can't tell how deep it goes because it's on a bit of an angle to the pipe below it. This is only the third building that the original developer built, so I suspect that it was forgotten.

Is there any risk to cutting it? Can any plumber do this, or should I find a plumber specializing in sewers? Should it be sealed with a plug or some sort of vent?

thanks in advance for any advice.

Here is a picture of it:

I would say that it is most likely a stub up for a clean out. In many areas, a clean out is required within 5 feet of the building. If this is what I think it is, there is no harm in capping it off low to the ground.

Before you cap the pipe I would make sure that the pipe is not a vacuum sewer system vent pipe. Vacuum system vent is usually shape like a candy cane but I would still make sure.

It could also be a vent for a house trap.