Delmonico has become our default steakhouse in Las Vegas. We've never had less than exemplary service and amazing food here, for either lunch or dinner. The staff is on-point, with notes made as to our personal preferences as to table location, etc. The waitstaff is friendly, knowledgeable, efficient and reliable. The food is superb. Quality ingredients prepared in quality ways. I definitely recommend the steak tartare as an appetizer. The only "heads-up" I'd give new patrons is that the sides are rather large. Ordering three or four sides with dinner is contra-indicated unless you are with a large group or dining with teenagers.
Excellent bar and bartenders as well. Ask for the whisky menu and just revel in the selection.