If you read my last post, you know that the Dutch were in control of, and then kicked out of, Tainan, all in the 17th century. Fast forward about 200 years, and Anping was opened up to foreign trade. There were a few main companies in Tainan, but only the Tait and Company building remains intact.
The Tait and Company Merchant House is visited together with the Anping Treehouse (I'll be writing about that next time) for NT$50, and is open daily from 8:30-5:30. It's easy to get there via the tourist bus. There are a few stops back to back as the Anping Fort, Treehouse, and Historical Park are all in that small area.