So let us imagine a massive space elevator is going to be built
who could build it ? Will it be the Russians, Private sector, NASA ? Liftport is a private company founded by some researchers that did major concept reviews for NASA not too long ago, and decided the idea was so good that they'd just go do it themselves. They are currently opening a carbon nano-tube production facility and research center so that they can fund their research into the long nano-tubes that will be needed for their cable/ribbon design.
and where would it be built ?
On top of the Rocky montains or above those mountains in Chile, or at a tropical area or equatorial nation ?
Kenya, Colombia, Indonesia, Somalia, Kiribati (the equator may or may not touch dry land), Ecuador
Some things to consider are keeping the project away from bad weather or hurricane areas.
Staying away from populated areas as there is the risk of falling debris or something landing on a crowded city/town
Keeping an eye out for Political trouble in an area, terrorism, a nation's policy change though public opinion changing or government instability - the French had a space site in Algeria but left it after some conflict with Algerian bombers and Russia is having some trouble with the former USSR republics.
Earthquake zone and fault lines would be a danegr to the space elevator
Where could it be built and who could do it ?