Advertising apartment building for sale in Orange County

I’ve been selling residential real estate for 10 years. I have just made my first step into selling multi-family/apartment building. Advertising single families is pretty simple, flyers, open houses, social media, direct mail., door knocking, virtual tours, etc. But selling to investors doesn’t seem like traditional methods would work. I’ve put the old methods to work already (targeted digital ads, direct mailers to absentee owners), but are there any methods that have been successful when marketing to investors.