Mosez Jones

Hello everyone, I'm new to this community and saw alot of informative discussions for audio issues getting resolved. Was hoping I could get some help. I recently moved into a condo space in the downtown area of my city, building is fairly new (2018) and since the move I've had buzzing from my Yamaha Hs7's whenever they're powered up. Now I have tried all the trouble shooting as far as ground looping and cable verifications (even bought new cables to try) bought a power conditioner brought the speakers to a repair man they worked fine where he lives. Now I'm slumped to understand what could the issue be and would love to get any help possible! Good day.