Need to support tall porch roof from ground

I have a 114yo Victorian with a back porch with a balcony above. The first level is the porch floor which sits about 4' above grade. The second level is the porch ceiling / balcony floor and is about 10' above the previous floor. The top level is the balcony ceiling / roof and is about 10' above the previous floor. The bottom two levels have rotted and need replaced. The top level can maybe be saved. My main concern is how to support that top level from the ground (about 24' below) while the lower two levels are re-built. I mainly need to support one corner which currently rests on a 6x6 pillar, hidden behind the tree on the left side of the photo. How does one go about getting a 20'+ tall support in there, with some jacking mechanism to lift the top level off of its existing pillar and hold it while that below is re-built? I can supply more details or photos if this is not clear.

LW

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Permalink Reply by LeRoy Williams on November 4, 2009 at 9:29pm

Rough sketch attached

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Permalink Reply by LeRoy Williams on November 4, 2009 at 9:53pm

While we're on the subject, what are some preferred materials for the middle level floor? The existing structure has two layers of t&g 1x4 with a layer of tar paper between. I'm not that interested any more in keeping it original, just sound and aesthetically pleasing. Both ceilings are (deteriorated) 1x4 t&g beadboard, which I will try to duplicate.