Nairobi suffered an estimated KSh 10.4 billion economic loss on Monday, July 7 during the Saba Saba Day protests due to widespread police roadblocks and business closures. The city's Central Business District (CBD) experienced a near-total shutdown of commercial activity as a result of stringent government and police measures.

• Most important fact or figure from the article: Nairobi's economy lost an estimated KSh 10.4 billion.
• Key person or organization involved: Police, enforcing government measures, brought the city to a standstill.
• Notable detail that adds context: Major roads like Ngong Road, Uhuru Highway, and Mombasa Road were sealed off, forcing commuters to trek or stay home.