anchor.diff:    bool _isLoading;
     DateTime _lastUpdated;
     String _error;
  +  int selected; //Keep less than 10
  +  final MAX_SELECTED = 10;
   
     ///MODELS
     Map<String, ParkingModel> _parkingModels;
  
positive.code:   ParkingDataProvider() {
      ///DEFAULT STATES
      _isLoading = false;
  
      ///INITIALIZE SERVICES
      _parkingService = ParkingService();
  
negative.code:     return List<ParkingModel>();
    }
  
  // add or remove location availability display from card based on user selection, Limit to MAX_SELECTED
    void toggleLot(String location) {
      if (selected <= MAX_SELECTED) {
        _parkingViewState[location] = !_parkingViewState[location];
        _parkingViewState[location] ? selected++ : selected--;
      } else {
        //prevent select
        if (_parkingViewState[location]) {
          selected--;
          _parkingViewState[location] = !_parkingViewState[location];
        }
      }
      notifyListeners();
    }
  