However, its not clear on HOW I should inform them..Via mail, via email?

I do hear people recommend this and I tried to email/call them and I've had no response despite multiple opportunities to reach out to them. 

I also see and hear those same "professionals" massively under-quote repair costs, forget to mention important due diligence items that if not checked can be a nightmare for the new buyer/operator, and make ridiculous claims that fly in the face of building codes/basic supply and demand factors/actual operating experience, and the like. 

Find something the well off, or well enough off, want and are willing to pay for and supply it. :-)

Many bears are in the camp that the credit bubble has supplied much of the appreciation we have seen over the past 10 years, and the trend is soon to break down. 

@Stacy Kiley feel free to give me a call or send me an email tomorrow. 

Thank you guys.All i did was email them the offer.

Many investors would not be excited by your example.The answer relates to risk tolerance; supply vs demand; and other factors (location, location)...But sure, one reason why investing in Real Estate works is because renters keep on renting!

Just a huge supply of duplexes in this area.

If I were you and want to maximize your time, I would create a video on Facebook, Youtube, or other sites to get the buyers to visit your one page landing site to collect their email in exchange of a free information book like wholesaling to educate the buyers.