13-15 Years
They bother people who live here. It is not clear who entered and neighbors are not comfortable with that situation. They can restore these buildings. ( Are there many abondened buildings here?) There were not before. They left empty those areas due to urban transformation. They don’t do anything right now. (You said it is not clear who enter here, what about crime rate? Since when it increased?). Yes, it especially increased this year. Now, there is too much crime, there was a crime every Sunday in the past, but now it is more quiet, they do secretly.