This building now in the restricted zone and can not be used by either the defending side (security) and then cannot be used by the attacking side (insurgent) because it serves no purpose or advantage for the attacking side (Insurgent) based on it's location and lines of sight; it's blocked by the objective building.
Please remove this restricted area to make this building and balcony actually serve a purpose. In the beta#1 you were able to use it just fine.