Bethesda-based commercial real estate services and finance company Walker & Dunlop Inc. reported third quarter 2017 net income Wednesday of $34.4 million, or $1.06 per diluted share, representing a 16 percent increase in net income over the third quarter 2016. Total revenues for the third quarter 2017 were a record $179.7 million, a 16 percent increase from the prior-year third…