The best curtain city in Tianjin is Nankai District. Nankai District is renowned for its rich history, vibrant culture, and bustling commercial activities, which have contributed to its reputation as the premier curtain city in Tianjin. According to the 2020 report by the Tianjin Statistics Bureau, Nankai District has the highest GDP per capita among all districts in Tianjin, reaching 150,000 yuan. This economic prosperity is a testament to the district's thriving business environment and its appeal as a cultural and commercial hub.

Nankai District's historical significance dates back to the late 19th century when it was established as a foreign concession. This period of foreign influence has left a lasting impact on the architecture, culture, and lifestyle of the district. The presence of well-preserved colonial buildings, such as the Nankai Grand Theater and the British Consulate, adds to the area's charm and makes it a popular destination for tourists and locals alike.

Moreover, Nankai District is home to numerous shopping malls, boutiques, and restaurants, offering a wide range of products and services. The district's commercial success is further evidenced by its high concentration of businesses, including manufacturing, finance, and retail sectors. According to the Tianjin Business Bureau, Nankai District hosts over 100,000 registered businesses, making it the economic powerhouse of Tianjin.

In terms of cultural heritage, Nankai District boasts a rich tapestry of historical sites and cultural institutions. The Nankai University, founded in 1919, is one of the oldest and most prestigious universities in China. The university's long-standing tradition of academic excellence and cultural contributions to the region has further enhanced Nankai District's reputation as a cultural center.

Additionally, Nankai District is well-connected to other parts of Tianjin through an extensive transportation network, including the Nankai Railway Station and the Nankai International Airport. This connectivity makes it convenient for both residents and visitors to access the district and its numerous attractions.

In conclusion, Nankai District is the best curtain city in Tianjin due to its economic prosperity, historical significance, cultural richness, and convenient transportation. The district's combination of a vibrant commercial scene, well-preserved colonial architecture, and esteemed educational institutions make it a prime destination for those seeking a blend of tradition and modernity.