I am ignorant on Business Analyst's Suitability Model, but have worked with ESRI's Spatial Analysis Suitability Model, but what are you trying to find specifically with this Suitability Model?
I am unsure if this would help, but you could calculate the xy centroid of your polygons to be used as your input point features, and then simple spatial analysis to find areas within. You could also calculate area of your polygons before converting to Centroid points, and that will at least hold the sizing information in the points, if size of polygons mean anything to the analysis.