Network topology / Topologie du reseau

I'm very interested in getting an idea on how much this broadband rollout is going to cost, particularly for the different stages. However, I've realized that the first thing I need to do is to decide on the topology of the network.

Here's a view of our residence from the air. I've marked the outline of the area I want to cover in red. The yellow lines represent where I'm planning on putting down the fiber once the street is open. The yellow star in the middle is where I'll locate the concentrator (right next to the cable company's box). Finally, the Yvelines Numeriques network and our France Telecom Exchange are in green. (You can get an idea of relative sizes by comparing things to the tennis courts at the middle right edge of the picture).

Here are the current questions I'm working on:

1. Does it make sense to run a dedicated conduit to each home in the residence?
2. What about the 24 apartments (12 in each building)?
3. Would it be best to have the conduit run all the way to each home or simply go to a small box in the ground just beyond the sidewalk - which would then require further trenching the last few meters when they signed up?

I'll post what I find.