If you don't filter room unit by floor level, all floor room unit will mixed together, you can see, room number 3xx and 2xx mixed
3xx means floor 3, 2xx means floor 2.
https://transparentgov.net/json2tree/arcgis/mapimagelayer/mapimage_filterBy_label.html?backgroundlayerurl=https%3A%2F%2Fservices.gis.msu.edu%2Fagsent04%2Frest%2Fservices%2FIndoors%2FIndoorsCorePublic_MIL%2FMapServer%2F5&layer=Units&dynamicLabelField=UNIT_NUMBER&_center_zoom=23&_center_lat=42.734346507795095&_center_long=-84.4824739332015
Now let's filter by level number, now you see only 2nd floor room unit appear, only 2xx, the other floor room unit was filtered out
https://transparentgov.net/json2tree/arcgis/mapimagelayer/mapimage_filterBy_label.html?backgroundlayerurl=https%3A%2F%2Fservices.gis.msu.edu%2Fagsent04%2Frest%2Fservices%2FIndoors%2FIndoorsCorePublic_MIL%2FMapServer%2F5&layer=Units&dynamicLabelField=UNIT_NUMBER&_center_zoom=21&_center_lat=42.7332685346041&_center_long=-84.47909486042654&select_field=10&select_fieldvalue=4&distinctorgroupby=groupby&orderbycountorvalue=orderby_value&zoom2feature_yesNo=donot_zoom2feature
https://transparentgov.net/json2tree/esri/server2/folder.html?org=https%3A%2F%2Fservices.gis.msu.edu%2Fagsent04%2Frest%2Fservices&url=https%3A%2F%2Fservices.gis.msu.edu%2Fagsent04%2Frest%2Fservices&arcgis_online_token=&select_folder=70&select_layer=