Seniors Housing (SH) REITs are on a historic run.  Typically, average SSNOI (same store net operating income) growth is 3-4% for all REITs.  In contrast, Welltower (NYSE: WELL), the largest SH owner, is on track for its fourth consecutive year above 20%, and Ventas (NYSE: VTR) is pacing for four years well into double digits. […]