The allowed values for biomes are: pine_forest, burnt_forest, desert, snow and wasteland.
The allowed values for townships are: city, town, rural and wilderness.
The allowed values for zones are: residentialold, residentialnew, downtown, commercial, industrial, oldwest and any.
Any other values will be ignored.
There it says:"other values will be ignored" and if that is not proof enough
rh_business_Monster_Flex_Gym(by_Swolk),28,21,50,-3,2,burnt_forest/snow/pine_forest/desert/wasteland,rural/wilderness/town/city,residentialnew/residentialold/industrial/commercial/residential/downtown,,
this one for example is working