Figured at 100'' that it had to be electric, and sure enough if you scroll down on the redfin listing, it specifies the type of fireplace and it is indeed electric. about $2k for the insert, another 2k for the TV, maybe another grand to 1500 for someone to frame the cabinet, run all the cabling for the AV setup, make sure you have all the right electrical hookups to power everything. More if you're running a complicated sound system that wasn't pre-wired...though in a space that small you could probably just get a good soundbar