private string GetOfficeDistinguishedNameByLocation(string location)
{
var preparedLocation = PrepareLocation(location);
var filter = _filterBuildingService.BuildFilterForGettingOfficeByLocation(preparedLocation);
var organizationUnits = _activeDirectoryService.FindEntities(_parentDistinguishedName, filter);
var unit = organizationUnits.FirstOrDefault(o => o.GetPropertyValue(ActiveDirectoryConstants.EntityAttributes.Location) == preparedLocation);
return(unit == null ? _parentDistinguishedName : unit.DistinguishedName);
}