To what extent is the landlord entitled to: 1. Place belongings under the building's staircase without the tenants' consent? 2. Prevent tenants' children from playing in the street in front of the building? 3. Prevent tenants' children from playing in the yard belonging to their apartments? 4. Prevent tenants' children from playing on the building's rooftop, knowing that they rented through a real estate office and there is no harm to it?

Placing items under the staircase: If this causes constriction, annoyance, or harm, the owner is not permitted to place them there. However, if it does not result in such issues, the tenants have no right to prevent him. As for the courtyard and the building's rooftop: If these are customarily considered facilities and amenities of the apartments, the owner has no right to prevent tenants from benefiting from them. As for the street: It is a public thoroughfare for everyone, and children playing in it is permissible as long as it does not cause annoyance or harm. Otherwise, the aggrieved party has the right to prevent them. These matters require knowledge of the reality and custom to be adjudicated, and it is advisable to tolerate the owner or move to another place.