. >> i think in addition to what david said, the constraint the site has being a slender, rectangular parcel, our design review direction started -- basically, it took shape based upon what took place previously. the board of supervisors are previously approved an appeal by -- by the planning commission, which actually approved the project and directed the department or the project sponsor to study a couple of environmental issues, one of them being air quality. so that sponsor at the time decided not to move forward. when this sponsor picked up the project, the sponsor was aware that these issues still remained. so that was one of the key sort of issues that sort of drove this project, and when we began this project, you know, we made the assumption that okay, obviously, a two tower design would minimize, you know, any air circulation impacts, and so that's what we started with. but as the project progressed, we obtains information from the air quality consultant and from our environmental planning staff that ultimately, the proposal that was before us would not have any significant impacts