Cost estimates

[Robert T.]

Dear BP RE developers:

We are building a single storey 2 Unit 2250 sf flat roof retail building (unfinished) in Houston on 8200 sf lot on a busy street. 

1. Was told that it is likely that we need to build underground french or storm drains. Anyone with experience on how much this might cost?

2. For professional fees; given estimates of   

Civil- $2,500

Structural- $2,500

MEP- $3,000

Architect-$4000

Are these numbers typical? Thanks for the advice and discussion.