About Us

We are a local, full service, commercial real estate brokerage and advisory firm.

18 Tremont Street in Boston

About Castlearch

CastleArch Property Advisors is a real estate brokerage and investment services firm based in Belmont, MA. The company was founded in order to provide large institutional quality real estate advisory and brokerage services to small and mid-sized business operators and investors. We have the depth of knowledge, experience and tools to offer best in class services, with the flexibility to quickly adapt and respond to the ever changing market landscape.

What We Do

CastleArch Property Advisors focuses exclusively on sales, leasing and advisory services within the commercial and investment real estate sector. We provide a full range of services to assist investors and end users, as well as business and property owners in finding the right solutions to achieve their real estate needs and objectives.

Our core competencies include Tenant and Landlord Advisory and Representation within Office, Retail, and Industrial space, and Commercial and Multifamily Investment Property Sales. With our institutional background and experience, intimate knowledge of the local market, and a high level of financial acumen, we are able to deliver excellence in every detail to ensure our clients have all the necessary tools to make the absolute best real estate decisions.

22 Union Street in Sudbury MA


Right from the first call, I was very impressed with Roberto. He is professional, timely, knowledgeable, and really helped me throughout the whole buying process. He truly takes an interest in his clients and is a pleasure to work with. Roberto will undoubtedly be my first call next time we require a broker!
Clay Nicolau


I’ve worked with a number of real estate brokers over the years and I found Roberto to be the best in Boston. He was professional, responsive, and prepared. I especially appreciated his consistent follow-ups about available listings or updates about the property that MWI secured in the end. He was also willing to research and answer some questions a few months after we signed, which speaks volumes about his commitment to the well-being of the client relationship. I highly recommend Roberto and look forward to working with him again in the future.
Chuck Doran

Executive Director

I have had the pleasure of working with Roberto since 2005. He is professional, diligent, and always open and honest. He always makes me feel like he is looking out for my interests. I would never do another real estate deal, whether purchasing or leasing without going to Roberto. Quite frankly, I don’t think anyone else could compare.

Shaun P. McMahon

President and Founder

CastleArch Property Advisors recently assisted me in selling some investment properties.

I got 3 proposals for the listings and theirs was by far the most comprehensive, well thought out and provided a reasonable explanation of the values of the properties along with a detailed marketing plan.

They generated great interest immediately upon listing and werevery helpful in assisting in all aspects of the sale to overcome the many hurdles of inspection issues, documentation requests and many scheduled visits to the properties.

I can’t say enough about their professionalism and knowledge within the industry as a whole. They were conscientious and tenacious, very effective with communications on a daily basis, and always had my best interest in mind.  

I have used several other agencies on real estate transaction in the past and can honestly say that these guys put in way more work than all the othersI would highly recommend them to anyone!

John Gangemi

The Gangemi Trust