3D Map design London City, for Game, Unity

I am looking for an experienced freelancer to produce a 3d map which will replicate the shape of london UK, this job is just for the 1st city map creation. In the future the chosen freelancer can be hired to replicate and create the same for other cities across the world. I have uploaded an attachment with some examples of the look i am trying to achieve. The city will will be broken down into 1000 plots of land which players will be able to place a type of building on. 100 buildings will be pre-placed on the map in different locations, these buildings will include 40 laundry shops, 30 Restaurants, 20 night clubs, & 10 casinos Plots around these amentites will be highlighted in a different color. Users will be able to view the map scroll left and right, and zoom in slightly. They will be able to see if the plot of land is currently available or occupied. This could be done by highlighting a boarder around the plot in a different colour. There will then be 900 plots remaining. A series of accommodation buildings can then be placed on these plots, example House, Villa, Mansion. As a player gets a house they will place it on the land they own. The map would then show this particular building on the map. Once all plots are occupied and buildings have been placed by all players the map would obviously show this.. freelancer will have some good experience with some map creating software and unity.