位在園區一角的神祕建築，關於它的功能眾說紛紜，包含崗哨、廁所、甚至是地道入口，目前尚未找到佐證的文獻資料。
在地耆老楊國斌表示，這是日本時代的男廁：
日本時代是一個廁所，很漂亮的一個廁所，就在靠近懸崖那個地方，用水泥蓋的。他就是男用的，站的，那只有一間是大號用的，不是小便用的。廁所在那邊，大概是要跟居住的地方有點距離。可是我們後來進去下去看，現在都已經改成花園了。
蔣中正總統的侍衛衛涂有景則回憶，在行邸時期這裡是地道入口：
那是逃生地道，逃到溪底下，現在沒有了，已經封掉。（以前的地道是從這個碉堡下去的？）對，那個時候剛好要封了之前，有走過，差不多五六百公尺而已啦，不會很長。人家以為是小便廁所，後來整個封掉了。
目前掌握的文獻資料中，在2002年桃園縣文化局委託中原大學建築學系進行《桃園縣歷史建築清查與電腦建檔》時，這座建築物外牆已貼滿磁磚，作為廁所使用。
There have been numerous guesses about the function of the mysterious structure in the corner of the Estate: a sentry, a restroom, the entry to an underground tunnel. No credible documents have been found to corroborate these claims.
A respected local elderly, Yang Guo-bin, described the architecture as a men’s restroom dating back to the Japanese Colonial Era:
“This was a men’s restroom in the Japanese Colonial Era, a restroom that was surprisingly pretty located by the cliff and built with concrete. It was of course used by men, exclusively. There were urinals, and just one small cubicle for Number Two. The restroom was installed there to keep off from the rest of the residential area. We visited that place sometime later and it was converted into a garden."
President Chiang’s personal guard, Tu Yu-jing recalled this architecture being an entry to an underground tunnel:
“It was an evacuation tunnel that led to a place beneath of the creek. It’s not there anymore because it’s been shut down. (“Could the tunnel be accessed from this fort?”) Yes, it could. I toured it once, right before it was closed up. It was about five to six hundred meters in length. Not very long. It was assumed to be a restroom. It’s now completely closed up."
According to historic records still extant, when the Bureau of Cultural Affairs of Taoyuan commissioned the Department of Architecture of Chungyuan Christian University (An Inventory and Digitized Archival of Historic Architecture in Taoyuan County) in 2002 to renovate the architecture, the outer wall of this architecture was already tiled up and used as a restroom.
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