Firstly, the top NE housing blocks, there's three of them that I used to start my city.  These are basically 7x7 squares, the easiest type of housing block to make and can get you a population of around 800 at insulae level.  Although all three blocks have access to all the consumables I was able to control which housing would evolve by the use of gate houses.  Each block has a gatehouse at every exit.  This allows  market buyers (not the traders) and cart pushers to carry out there normal tasks but prohibits other walkers like the bath lady and priests to wander aimlessly around the whole of your city.  Instead they are forced to do a continuous loop which ensures no home looses that walkers particular amenity.  With the granaries and warehouses within close walking distance to all three blocks, devolvement should be very rare indeed.  The reason for three granaries is that I like to ensure that no market buyer ever makes a wasteful trip.

Now onto the district just south of this.  Here you have three blocks that are connected with just a gatehouse to prevent walkers from wandering around my docks.  I've kept this at casa level as it only requires food and and amenities to get to this level. This is not as stable as the northern district as there is intersections and walkers can and will walk a way that you don't need them too. Market traders too will on occasion miss out some areas although most of it is pretty stable and only a few houses devolve for any length of time.  On the upside, this area holds alot of housing and can supply alot of labour if required.

South of this again is the is my medium insulae block, I determined its size by using the water overlay, I placed a resevoir and placed the road around its limit.  Then I housed tents on the inside and did another road inside that again.  This block can hold alot of people and has plenty of room for amenities in the inner road and outer, by using the gatehouse i've given it's walkers two large loops to walk, This has the advantage of being able to cover your educational and entertainment needs with less buildings.(don't pay attention to all them schools) This will have some devolvement as I haven't supplied enough food.

Now onto the other large block west of this. This is where I decided I'd have my luxury palaces. Its the same as the above block with the exception that i've placed statues on the outer road so that I could restrict access to the three palaces and save all the housing evolving to villas and above.  You'l notice that in front of the palaces there's a market with all the others in the inside of the block. This market supplies the Palaces with that  second and third food source, the third source is imported and wouldn't be enough for the whole block and would probably cause the palaces to devolve.  You'l notice that the warehouses and granaries are allways full or getting filled as soon as the buyers take food, this ensures that this block never devolves.  The palaces have been going for years now and will do so for many to come.

Lastly you'l notice my tent block, this is solely to supply labour if needed and comes in handy if your suddenly short for some reason.  I use this when starting up. I get my trading going with this block and its the last thing to go just before I finish the map.

finally if you'd like a little challenge.  Although with the culture rating so low and prosperity not quite there you can complete this scenario in under 20 minutes, can you figure out how to do it.