Columbia subject headings:
Skyscrapers--Designs and plans.
Skyscrapers.
Tall buildings--Designs and plans.
Tall buildings.
Harvard subject headings:
Apartment houses--Designs and plans.
Architecture, Modern--21st century
Multipurpose buildings--Designs and plans.
Office buildings--Designs and plans.
Skyscrapers
Skyscrapers--Designs and plans.
Tall buildings
Tall buildings--Designs and plans.
Princeton subject headings:
Skyscrapers--Designs and plans.
Skyscrapers.
Tall buildings--Designs and plans.
Tall buildings.