public FilterDefinition CreateDefaultFilter()

//Must be called on the MCT
//Creates a default filter on the building scene
//var bsl = ...;
var filter1 = bsl.CreateDefaultFilter();
var values = filter1.FilterBlockDefinitions[0].SelectedValues;
//values will be a single value for the type
//"CreatedPhase", value "New Construction"

//There will be at least one filter after "CreateDefaultFilter()" call
var filtersCount = bsl.GetFilters().Count;