I remember that the detective had an apartment that could change interior colors. I also remember one character, who was a boss of some sort that had bodyguards that were, maybe, genetically modified to be super beefy and could flick off bullets.
I'm pretty sure that is "Only Forward" by Michael Marshall Smith.
Stark lives in Colour, a neighbourhood whose inhabitants like to be co-ordinated with their surroundings – a neighbourhood where spangly purple trousers are admired by the walls of buildings as you pass them. Close by is Sound, where you mustn’t make any, apart from one designated hour a day when you can scream your lungs raw. Then there’s Red – get off at F**k Station Zero if you want to see a tactical nuclear battle recreated as a sales demonstration.
Stark has friends in Red, which is just as well because Something is about to happen. And when a Something happens it’s no good chanting ‘Duck and cover’ while cowering in a corner, because a Something is always from the past, Stark’s past, and it won’t go away until you face it full on.