landlord not giving notice before entering building

[Lane Smith]

I have a family member renting an upstairs unit in a 4 plex. The basement is split with each side housing w/d hookups for 2 units. The basements are only accessible from the stairwells of the 2 units on each side of the building. The landlord has entered a locked doorway belonging to my family members apartment and gone into the locked stairwell leading to the basement. He says it is common space and he can enter at will with no notice required. The basement is shared with another tenant but the only entrances to the basement are through the apartments. I am confused as I thought having to go through a tenants locked space(even if it is a rear stairwell) is not considered 'common' space but the individuals rented area and therefore subject to the common 24 hour notice. This is located in Wisconsin if that helps. It seems like he is violating some type of privacy but I am not sure where to look. If you have any information on this please let me know as it is very stressful. Thank You

[Jim K.]

@Lane Smith

If I was your family member's landlord and she brought me this argument with the current housing shortage, I'd be counting the days to the end of her lease.

"It's shared storage space with another tenant, as designated by the landlord, but not common space available to the landlord and/or manager. The landlord tells me who I must share the space with but other than that his authority ends at the door."

It doesn't make sense. It can even be argued effectively that the landlord, having designated the two parties sharing this space, has a continued responsibility to oversee the utilization of the space and adjudicate any disagreements that might arise from sharing the space between the two parties.

If your family member wants such inconsistent niceties of control over her living and storage spaces she would be well advised to buy the roof over her head instead of renting it from someone else.