Unless such crime is brought under control, the future is in high rise apartments. Some of the wealthiest people in the world (even in Kenya to some extent if you think about the Asian community) live in apartments.
They are prone to petty theft but you have to be really ballsy to forcefully drill through an apartment like that unless it is in a remote area. I foresee a good number of middle/upper Nairobians moving from suburbia into apartments especially as they get older. 30+ floor residential towers will start popping up closer to the city to accommodate this demand.
All my friends are heathens, take it slow. Wait for them to ask you who you know. Please don't make any sudden moves.