When it comes to establishing trust in any property agent (commercial or residential) I would say it's down to reputation, credibility and client testimonials. Being true to your word, being ethical and reliable with both property sourcers and investors are essential to building a good reputation. When it comes to anything property, trust is everything and you cannot establish trust though adverts alone. Investors (possibly more so than many other industries) don't want to be 'sold to', a consultative approach is always better.
If you would like any help showcasing your company on propertyforum.com please feel free to message me directly, i'd be happy to help.