In the 80s, a very ambitious program of renovation was launched. The Tower structure was given a thorough examination, strengthened in certain locations and lightened in others with the removal of 1,340 tons of material that had been added over the years. Safety standards were redefined and adapted to modern requirements, particularly where they concerned fire safety. The third level elevator was replaced, as was the old spiral staircase, which gave way to a new rectilinear staircase in keeping with the Tower design, reducing the transparency of the spire. This ongoing maintenance is intended to keep the Tower in excellent condition: meticulous care is given to the monitoring of change relying on the latest techniques available so as to prevent any possible deterioration. This rejuvenating process helps give the Tower a very long life expectancy.