Why can't I build a farking gym?

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I like to build new commercial lots for my Sims to have something else to do "downtown." I have the "Complete Collection," which is supposed to include all the expansion packs - Livin Large, Vacation, Hot Date, and House Party - so there shouldn't be anything I can't do with it. But I can't build a gym! In the "house" items there are two weight machines and a set of volleyball standards but none of those are available in the "commercial" items that you can put into new (or old, whatever) commercial lots. Does anyone know why or know how to get them into the commercial items so I can build a gym? What Sim wouldn't want a place to workout, get fit, and find himself a "honey?"