I was at a friend's last night and he is one of the few I know who did it right. It's combination residential-commercial property; old two story house in the front with office addition and garages in the back. Not fun to have to wire but he hired one of the best audio shops in town and did the full cat-6 hdmi run throughout. Projection screen with full surround system in the upper board room, speakers in reception, flat screen in the lower board room, tv in the kitchen, big screen and full surround in the living room, speakers on the patio and in the garage, and he can cast to multiple rooms. Doesn't hurt when you can charge it all to the business. :D\n\n\nIf he charged the resi part to the business, it needs to be used as rental property, if the IRS guidelines are met. If he lives there, he could be dinged at tax time. He might be able to smooth it over if he considers it a 'capital improvement' and amortizes it over the usual five years since it's not a long term (macrs) deduction like a roof, outbuilding, driveway, etc, AFAIK.\n\nI'm not a tax expert and I didn't sleep at a Holiday In Express last night.