This is an easy walk from the California Academy of Sciences, and worth an hour or two if you like conservatories.
When went here on a whim and spent an hour or so admiring the tropical plants. It's small but there are benches here and there so you can sit and look at the plants and, if it is chilly outside, warm up.
We didn't visit the butterfly room- we'd just come from the CA Academy of Sciences- but got to see some flowering orchids, a flowering hibiscus or two and lots of other tropical plants, including looking at all the plants in that little tropical food plant alcove.
If you like old conservatories and/or some tropical plants this is a good place to spend some time.
There is a bathroom outside the conservatory, to the right as you exit.
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