at 17', you'd need a downrod about 72". (I think you are trying to get too low. At 14Feet, the distance between fan and floor is 9')

if you want it lower it, you'd have to verify it's ok w/the manufacturer. The rod/fan may break w/something that long and the strain of turbulance/vibration on the unit. (and with wind coming in from outside)

Something to keep in mind.

https://ceilingfanpro.com/ceiling-fan-downrod-guide/

You just have to find the right manufacturer. they do make units w/extra long downrods.

You may want to bring in a pro in order to determine the best height and unit for your space.

your blade span is also important

https://www.ceilingfan.com/extra-large

There has got to be something it's probably custom have you talked to your GC or Electrician?

Depending on the look youre going for, this company may have one. They do industrial, commercial and residential.

https://bigassfans.com

Thank you all for the feedback thus far.

At 17' ceiling, and with a 72" downrod, the fan is is at 11' high, which seems too high for me.

I think you bring up a good point though, there might be safety issues with longer rods. These inspiration pics I attached are from Costa Rica and maybe they don't have the same codes (or follow them) as in USA.

I suppose a greater blade span would be the good compromise. Darn, I wish I could get them a little lower though.

you prob can. you''ll need to find a company that makes their fans for extended lengths. many commercial places have them.

just do a bit more in-depth searching. maybe start w/a high end ceiling sales and ask them. or ask purchasing in the large hotels if they have a brand they use.

Such a tall ceiling with such a low ceiling fan seems to conflict with each other, as in poor design. You should rethink your ceiling height.