Peter Maclennan – Real Estate Broker Serving Concord, Clayton, Pleasant Hill, Martinez, and Walnut Creek Who is Peter Maclennan? Licensed Real Estate Broker in California, DRE #01801793. Maclennan Investment Group, Inc., CA DRE #01871809 Interested in Buying or Selling Real Estate? Contact Peter to get started on your process today. Name Warning Email(required) Warning Phone Warning Message Warning Warning. Submit Δ