Guerilla Marketing High-End Residential Property

What are some of the most rapid, successful and proven tricks and techniques you have used to attract qualified high-end cash buyers of $1M+ residential real estate?

You only seek high tech income wage earners. In Silicon Valley avg single professional makes $150K plus RSU etc. A couple make twice that much. I will not work with anyone who has <20% down which is about 300-400K even if you have great income. Sorry, sellers will entertain someone else offer(S).
This is very much a referral business.