By Mary Ryan, Contributor Thanks to Chip and Joanna Gaines, Martha Stewart, HGTV, DIY Network, Pinterest and numerous other home-focused professionals, programs, websites, blogs and publications, home improvement and house flipping have become trends embraced by nearly every American on some level. The general public is now privy to a secret that commercial investors and property owners have known forever: strategic improvements can add outsized value to assets, whether you plan to hold it for the long or short term. For many of these commercia…