You are behind on your rights. You should have issued a 3-day pay or quit the first month they withheld the rent, and moved forward with the eviction. Unless there was a written agreement (aka 'contract') for you to give them rent credit for the 'improvements' they made, you owe them nothing. If they remove the chandelier, they must replace it with the one they removed or pay for one of like quality, and the cost of the electrician is on them.
Now, they have stuck you for several months of unpaid rent, and when you sue them - you are going to have to - leftist leaning judge, you never know what you'll get, might just decide that you got the value of the rent in the work they did. That's not how the law should work, but judges sometimes write their own. The mistake you made was by waiting so long. If they have already moved, you can't evict them so you have lost the ability to put an eviction on their record.