Imeici Spire was a tower that was constructed on Coruscant and used by the Inquisitorius as a base to run the Sarlacc Project. Inside it they kept various designers, whom they forced to design a Super Star Destroyer prototype.
It was destroyed during the Mission to Coruscant, when Inquisitor Nolor initiated the tower's self-destruct in an attempt to stop the Alderaanian Resistance.