The other day me and my flatmate came home and both realised that the window on the first floor of our flat in the communal hallway was propped open and there was a ladder leaning against it. We both thought it was weird at the time but dismissed it and saw that it was shut the next day. When we spoke about this we thought to check the flat cctv as we have cameras in communal areas. About a month ago a vacant shop was bought by a group of guys which is directly next door to the flat (this area is main city centre). We’ve seen them working on the shop and it seems to be the same group of 3-4 guys. When we checked the cameras we noticed it was the same group of guys that came into the flat and opened the window. There was a ladder there and someone passed a drill through the window to them in the flat. It also seems that they have managed to access the flat basement which I was told upon buying was inaccessible and have never seen anyone access it in the past year. They come and go throughout this day maybe 3-4 times. They leave the front door propped open for about 3 hours and then come back and close it. I’ve attracted photos of the guys at the window I’m 99% sure they do not live in this building and can’t seem to think of a logical explanation for this. Does anyone have any ideas on what could be going on?? We’re pretty creeped out. 

Potential neighbours or break in shop owners???