The slump in real estate is definitely Jubilee policy mistake - Njomo interest rate control hit the real estate sector as bank loan (credit) disappeared - The whole policy backfired. Jubilee has since done away with it.
But it was worth a try. Policy Experimentation is crucial.
I don't think this would have been bad iff jubilee borrowed internally and bank roll infrastructure that use locally available material and manpower. Money could have trickled back to economy.
Jubilee lowered interest rates, borrowed, stashed cash, and bankrolled chinese, mexico maize etc. That's when Kenyan business started starving.