Hi,

This tree doesn't look anything like any maple I've seen.  It's not a maple. The black spots look like a fungal issue. I'm at a loss here. I can't identify the tree which would help figure out what the problem is. Here is a link, scroll down and look at bacterial issues;

https://extension.umn.edu/plant-diseases/leaf-spot-diseases-trees-and-shrubs#bacterial-leaf-spots-and-blight-1156513

I'm sorry I'm not being very helpful. I have sent this question out to other MG's and maybe someone will have more information. You could send in a sample to the UMN  Disease clinic ,'https://pdc.umn.edu/

Sally Granath

St. Louis County MG

Well, you taught me something. I'm not familiar with that tree but I see that it is on the DNR's list of "specially regulated" species. 

https://www.mda.state.mn.us/tatarian-maple 

I found this helpful link;

https://www.torontomastergardeners.ca/askagardener/manitoba-maple-with-black-leaves/

Sally Granath