Jamsil (Songpa) has never once surpassed Banpo (Seocho)

Someone in the bullpen has been continuously spreading false information and baseless fabrications about a specific individual; they seem to be a die-hard Jamsil lover who joined only 6 months ago.
The facts must be corrected. Saying that Banpo was only half of Jamsil in the past is nonsense; the floor areas are completely different, so you should compare similar sizes. Look at the objective data.
<1970s>

<1990s> Old Banpo Jugong 32 pyeong vs. Jamsil Jugong Complex 5 34 pyeong
Banpo: 280 million sale price / 90 million jeonse price vs. Jamsil 5: 180 million sale price / 60 million jeonse price



After the development of the Yeongdong district (Seocho-gu and Gangnam-gu) in the 1970s, the Jamsil district was developed in the mid-1970s.
So, you can look at the period from the mid-to-late 1970s onwards.
While Banpo along the Han River is currently the wealthiest neighborhood in Seocho-gu, in the 80s and 90s, Bangbae-dong and Seocho-dong were the wealthiest areas in Seocho.
Songpa didn't really have a wealthy area until the new influx occurred during the '86 Asian Games (Asan/Jamsil-dong) and the '88 Olympics (Olseon/Bangyi-dong).
Anyway, if you look at the last 50 years, most of Jamsil consisted of Municipal Jugong; while Banpo also had Jugong, Old Banpo had large-sized units, and its market price was always higher than Jamsil's. Jamsil had many truly small-sized units. To be honest, you know what the Municipal Jugong was like, right? Regardless, the start of Gangnam was Banpo, and in reality, Gangnam and Seocho are grouped together.
You can check the newspaper archives below.
It has always been Banpo > Jamsil, and the large-sized units in Seocho-dong and Bangbae-dong were on par with Apgujeong in the past. In particular, there was a time when Sampoong was more expensive than Apgujeong Hyundai.