I've been watching the D.C. market for the past year and I can't help to notice I can get double the return in my college town and triple the return in Baltimore. 

Keep in mind that they "forget" half of the things that need repairs or simple don't know so when you do it like that there tends to be a lot more "re-negotiation" once you find out your repair estimate doubles or triples.  

My business tripled the first year out of my basement. 12 years later, I'm fortunate to have 3 offices, 2 here and 1 in Manhattan.

I am exploring acquiring my first Triple Net Lease property ($1.2MM range) via a 1031 exchange.  

Holding for the last 15 years in the Bay Area has yielded more like ~triple valuation, so depending upon starting number, could be a lot, lot more appreciation to access with mortgage or HELOC.

I would double to triple that estimate. 

He got triple his original price.

I have formed a Wyoming LLC that owns a Illinois LLC.Currently the value of both of my properties, upon completion, will be over triple my purchase price and likely double the price + investment.

It's YOUR project, YOUR business, YOUR house -- which means when something like this goes wrong, it's YOUR fault.Given your description of the issue, I'm going to guess that this guy is a handyman type, and isn't full-time tile contractor -- professional tile contractors wouldn't make a mistake like this (they would check, double-check and triple-check their work before proceeding).  

Sure, some will triple/quadruple their earned income, and can invest more aggressively in their 40s, but more likely, the majority will triple or quadruple their family size instead (going from being single, to having a spouse and two kids, on the same earned income...ouch!)