===== My 注音 typing TOOOO slow...so, I will type in English w/ some Chinese, please bear with me, thanks again.
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I believe the answer is "Yes!" and it's "Chih Kan Lou" 赤崁樓/承天府 for the following reason.

1. Though there are indegenous Taiwanese, such as 林少貓, 朱一貴..等等; honestly, I believe their magnitute is more of local/regional and most of all, their empire/regional kingdom were either burned down (do not exist today!) or their 行政中心 or 皇居 is not up to the scale or standard of a 皇宮.

2. Republic of Taiwan 1895 whose president was Mr. 唐 , a Qing Manchus officer = flee back to China as soon as the Japanese came = not good enough to be the Taiwanese King!

**Furthermore, The defination of official Imperial time/kings' age lies mostly around 1600 to 1850s by Euro/US Text Book though some still exist today like Japan and England. Therefore, with all my short research, here are the result...

1. 明魯王 lived and died in Kinmen in the mid 1600s, left over Chinese Dynasty king = can't represent Taiwan or Taiwanese, plus his home in Kinmen was like a prison = not good enough!

2. 明寧靜王, same like above = left over Ming Dynasty Royalty, can't represent King of Taiwan; though his "temporary" refugee home was converted to 大天后宮 and still existed today as well as his wives' home in 五妃廟 and well preserved.

That left with one and only one possibility = Koxinga and his decendant..
Koxinga = 延平郡王/海澄公/國姓爺/開台聖王/鄭成功, these titles are given by the Qing Emperor, 明桂王, as well as "Taiwanese!!" 開台聖王.

Lastly, checking out his blood lines!!!

Though Koxinga claimed himselves as Chinese, as Chinese has claim him
as one of their own national hero like Taiwan. He is without a doubt!!!
A mix of Japanese mother and Chinese father!! Which is
virtually hard for Chinese to swallow. However, Taiwan is a country of multi cultures = many tribes (19 tribes) and many races. And honestly, I belive myself to be a mix of aboriginal and Han Chinese?? though I am a 100% so called "本省人," I believe Taiwanese are more tolerant to accept others eventually.

Also, though Koxinga established 東都, it wasn't until his son who changed the dynasty/Tainan county/Taiwan country name to 東寧王國! Even though I believe, had Koxinga not died at the age of 39, he would eventually declared independant having realized that his dream of overthrone 滿清 is sliping away.

Though Chih Kan Lou 承天府/赤崁樓 was based on fort "Provintia" and the current structures buildings that we see are actually built in Qing dynasty!! But, I believe that is still the Palace site!!! Since many Palaces in the world does not neccessary been built by the king themselves!!!! sometimes, they just take over!

Ex. many european kings/Lords. Also, birth/royal blood is not considered here, since a "New Kingdom" is formed!

Palace defination including "admistration buildings!" = 承天府/赤崁樓 !!