The problem traditionally with UV window film is that its effectiveness
is relatively short, perhaps 5 years or so.  At least that used to be the
case.  For some reason, if you have the money to replace the windows with
glass that contains UV filtering, that lasts much longer.  A more expensive
solution would be to use frit glass, which is glass silkscreen with small
dots (used, I believe, in Helmut Jahn's United Airlines terminal at O'Hare).
I don't know what that does for UV problems, but it can cut down on light
transmission to varying degrees according to how you order it.  There also
are floor to ceiling shades that work similarly to frit glass, the kind of
shades Richard Meier has used.  Probably a local architectural firm would
be able to suggest vendors.  The film might be the least expensive solution
in the short run, but do ask how long its effectiveness lasts.
Good luck.
Mike Danoff