In Nairobi’s satellite towns — from Ongata Rongai to Kamakis — a new kind of real estate arms race is underway. But it's not about square footage or marble countertops. It’s about security — and not just any security. The buzzword now is smart estate security Nairobi, a hybrid approach blending high-tech systems with the trusted presence of human guards. As the city expands and more Kenyans...