Why Kenyatta Avenue in Nairobi has many banks

The Standard Chartered Bank building and The building of Indian Bank along Kenyatta avenue

There are very few major banks which are not represented along or off Kenyatta Avenue in Nairobi.

Let us count: Kenya Commercial Bank, Barclays Bank, Family Bank, National Bank, Equity Bank, Standard Chartered, Stanbic Bank of Baroda, Bank of India, Housing Finance Corporation...