What would you look for in skills for trust building?

[Clayton Collins]

I work as a residential realtor and I've done 4 sfr investments and 1 industrial investment.  My intention is to buy large apartments and I've talked with 3 different groups that do it locally to me.  I would like to run them myself and it seems that joining someone would make it go much faster though.  What skills or certifications would you recommend that I could bring to the table that would help build rapport and get me in the door faster or better?