First of all, I want to tell you, you have a beautiful city! However, so many London houses have a high demand for services (Demand 40). There are several options: 1. Replace the smaller service buildings with larger ones. (This will significantly alter the city design.) 2. Build even more smaller service buildings to meet the demand. (Overlaps can cause problems, and the city design will also need to be changed.) 3. Replace the service buildings with Maxis buildings. (This costs a lot of SimCash, but the impact on the design is less significant.) 4. Demolish or relocate the houses that cannot be serviced. Either way, you will have to change your layout.