1884年清光緒十年，臺北府城北門建成稱名承恩門，是清朝在此地所建五座城門中，唯一維持原建樣式至今的歷史性建築。1895年日本軍隊由北門進入臺北城，並自1904年起強硬拆除四圍城牆與城門，西門拆毀後，所餘四座城門因日本學者請命得以保留。北門周邊因地理交通位置重要，陸續興建了臺北鐵道工廠、臺灣總督府交通局鐵道部廳舍與臺北郵便局新廳舍等重要政府機關，以及三井物產株式會社倉庫等二三層樓高的商業建築。

臺北郵便局即今臺北北門郵局，建築師為栗山俊一，1930年落成，為三層鋼骨結構新古典混合樣式建築，整體成梯形配置，主樓大廳朝向西北方位的北門，左右沿街道延伸兩翼，正門前原有向外突出的五連拱長形門廊(Portico)。1969至1971年間，郵局在建築體上加蓋第四層，門廊亦遭拆除，「北門郵局｣即繪於此一時期。

本幅水彩以左右均分畫面構圖，右面為郵局大樓西翼建築體，宏偉嚴謹的四層高樓上，開設連續式圓拱大窗與矩形長窗，西照陽光在其立面與路樹街道上形成明度極高的光影，色彩鮮麗的公車已入站，乘客正依序上車。建築、道路、車輛與路人，以斜角一致朝向左前方的北門。北門主體結構清晰色調沉穩，維持日本時期拆除城牆後的圓環形式，車輛環繞而行，左右後方有鐵道部廳舍、商業舊樓榮記商行及臺北工場鐵架輪廓。

In 1884, in the tenth year of the Qing Emperor Guangxu, the Northern Gate of Taipei Prefecture was built and named Cheng'en Gate, which is the only historical building among the five gates built in this area by the Qing Dynasty that has been maintained in its original form. In 1895, the Japanese army entered the city through the North Gate and forcibly demolished the four walls and gates from 1904 onwards.

After the West Gate was demolished, the remaining four gates were preserved at the request of Japanese scholars. Due to the important geographical and transportation location of the North Gate, important government agencies such as the Taipei Railway Factory, the Railway Department Office of the Taiwan Governor's Office and the new office of the Taipei Post Office were built, as well as two- and three-story commercial buildings such as the warehouse of Mitsui & Co.

The Taipei Post Office is the present-day Taipei North Gate Post Office, built in 1930 by Shinichi Kuriyama, and is a three-story steel and bone structure in a neoclassical mixed style. Between 1969 and 1971, a fourth story was added to the building and the portico was demolished, and the "North Gate Post Office" wording was painted during this period.

The composition of this watercolor picture  is divided equally between the left and the right. On the right is the west wing of the post office building, a grand four-story building with large continuous round-arched windows and long rectangular windows; the sunlight from the west creates bright shadows on its façade and on the street. The brightly colored bus has entered the station and passengers are boarding in order. The building, the road, the vehicles and the passers-by are aligned at an oblique angle towards the North Gate on the left front.

The main structure of the North Gate is clear and calm in color, maintaining the circular form after the dismantling of the city walls during the Japanese era, with the cars circling around, with the Ministry of Railways building, the old commercial building of Rongji Commercial Building and the outline of the iron frame of the Taipei factory behind.