Realty Income is the 800-pound gorilla in the net lease REIT space. Is it too expensive to buy? Maybe not when you consider other options.Realty Income (O -0.05%) is a well-known net lease real estate investment trust (REIT). In fact, it is roughly four times larger than its closest competitor. That said, it has one of the highest yields in the net lease niche at roughly 5%. Is it still worth buying after a sizable rally? It just might be when you compare it to some of its most popular net lease peers.A qui ...