Window Recommendations

[Michael P.]

I am in process of developing at 2300 sq ft property in New York City to a 4100 sq ft property through a gut renovation/extension, including adding a 3rd floor to the building.  

The building will be contemporary in terms of design, so some commercial style windows will be needed.  This is my first development of this property type, so I was curious to hear which vendors delivered good value and design for similar projects.  While I could be wrong, I don't believe typical stuff from Anderson, pella and marvin are suitable for this design.

As an investory thinking about the project in the context of a flip, maintaining a lower cost basis is a priority of mine, while delivering on thermo-efficiency and design.  

Any suggestions are appreciated.