Anyone interested in a giant lizard, please consider a Black & White Tegu.
I had a male that grew to 50" and weighed nearly 20 lbs. He was truly tame. He free roamed the house all the time. I could put him on a leash and walk him outside.
I long to get another one but won't do so until I can offer him ample space as I did last time. Mine grew up with a 8' x 3' indoor enclosure and a 12' x 6' outdoor balcony dedicated to him. He stayed outside for about 8 months of the year.
He remained very tame and healthy but he died when my house burned down. :-(