Awful good estimation by bruce.desertrat.
Perhaps MESTA acquired it via auction lot; didn't know something so small was included?

Common brick is 2.25" high. Foundation is 5 courses with 4 mortar joints @~.6 (judging by the stack of 6 at left front corner) or kind of 13-5/8". Furnace box about 4x that 13.6, or 61"; 61"+13.6= ~74.8" (74.8/12 = 6.2').

Noooo, didn't stay at Holiday Inn last night, did employ Gerber Vari-Scale though. Enjoyable device, once in awhile wish it wasn't two feet long.
(drumroll please, cue for marksbug...)