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You are talking about two separate types of branches pertaining to architecture. The most profitable would be designing new building, as in Dubai. Possibly the most rewarding would be preserving the beauty of older buildings such as Grand Central Station. Did you know that in the 70's New York wanted to demolish Grand Central Station and Jacqueline Kennedy protested so loudly and saved the building! Just compare the once grandiose photos of Penn Station and visit the dungeon we call the present Penn Station. To conclude, if you want cash go new, if you feel it in your heart go old.