About Us
RockWater is affiliated with KW Commercial the commercial real estate arm of Keller William Realty, the number one real estate company in the United States. Keller Williams has over 790 offices in 49 states in the US as well as offices in 24 countries and regions around the world. RockWater has access to the overall commercial team consisting of the most knowledgeable, results-driven brokers backed by the most innovative and scalable technology the commercial real estate industry has to offer. When you work with a KW Commercial broker you are not just working with a single broker, you are hiring a vast network of dedicated real estate professionals.
Our Services
Commercial, Residential, and Investing
Large or small, condo or mansion, we can find it and get it for you at the price that's right. TLCs? Fixer-uppers? Luxury? We can help with all of it. We always have a current list of available properties for you to check out.
Beyond Bricks and Mortar
A business represents far more than the building that it is housed in. A business's true worth involves many factors, and value is determined by the ability to understand and accurately analyze those factors. A business may have particular innovation, technology, or other growth capacities that can be utilized in determining both value and future earning capacity and growth. An effective Business Broker needs expertise beyond commercial real estate to determine the many factors that impact business potential. Successfully navigating business scaling, family business dynamics, and the sale of businesses has been our business for more than 30 years, and we know we can help yours.
Rely on Expertise
Real Estate Brokerage and Business brokerage a dynamic relationships between a business owner and advisor. Our style is collaboration and partnership because the outcome must achieve your particular goals and meet your unique needs. We hope you will consider speaking with us about your business questions so that we might offer assistance in your future success!
Meet the Team
David W Costello
David W Costello
David W Costello
Dave Costello owner and managing partner of RockWater Group, KW Commercial Realty, has been a business leader in the Greater Portland community for more than 30 years. He previously owned and operated Sun Media Group, whose holdings included companies from Southern, Central, and Western Maine. Within the industry, his roles included buyin
Dave Costello owner and managing partner of RockWater Group, KW Commercial Realty, has been a business leader in the Greater Portland community for more than 30 years. He previously owned and operated Sun Media Group, whose holdings included companies from Southern, Central, and Western Maine. Within the industry, his roles included buying, selling, managing, and developing businesses. In commercial real estate, he worked with Daigle Commercial Group, specializing in the hospitality industry. Dave has extensive experience in management, technology, marketing, and customer service. He brings excellent negotiation skills, a broad knowledge of the local business market, and a passion for helping people facilitate business goals. RockWater Group provides a complete range of commercial real estate services to its clients.
Carie Costello
David W Costello
David W Costello
Carie is an Associate Broker for RockWater. She has a master’s in education and taught school for eight years. Combining teaching and business Carie started her own business offering color and style consulting to professional women. She soon expanded into women’s clothing with three retail locations. Carie has business expertise and the
Carie is an Associate Broker for RockWater. She has a master’s in education and taught school for eight years. Combining teaching and business Carie started her own business offering color and style consulting to professional women. She soon expanded into women’s clothing with three retail locations. Carie has business expertise and the entrepreneurial grit that successful businesses require. Her business model has been to offer the best in customer service and attention to every customer.
Carla Maganello
David W Costello
Carla Maganello
Carla is an Associate Broker for Rockwater. Previously she was a Senior Level Executive who had more than 20 years of experience with a major sporting goods retailer. Carla successfully guided the construction of 140 new retail establishments in eight states, using exceptional cost containment processes and lease negotiation skills.
Thro
Carla is an Associate Broker for Rockwater. Previously she was a Senior Level Executive who had more than 20 years of experience with a major sporting goods retailer. Carla successfully guided the construction of 140 new retail establishments in eight states, using exceptional cost containment processes and lease negotiation skills.
Throughout her career, Carla’s success in the field of commercial real estate was derived through her extensive team building ability that cultivated relationships with local contractors and property owners, fostering smooth, cost-effective real estate solutions.
Carla is a lifelong Maine resident who lives in the Portland area with her husband and two sons. She is an avid sports enthusiast whether as an athlete herself or a supportive sports mom. Her many boards include United Way, Make-A-Wish, and Olympia Sports Foundation
Meet the Team
David J Costello
David J Costello
David J Costello
David Costello received his real estate license as a freshman in college. David is an associate broker for Rockwater Group. He has experience working with both buyers and sellers. He is trained with the Matterport software a 3d imaging platform for real estate. David has always worked in his family’s businesses and started his own car d
David Costello received his real estate license as a freshman in college. David is an associate broker for Rockwater Group. He has experience working with both buyers and sellers. He is trained with the Matterport software a 3d imaging platform for real estate. David has always worked in his family’s businesses and started his own car detailing business early on in his career. A born entrepreneur always researching and finding investment properties for his clients.
Mike Keaney
David J Costello
David J Costello
Mike grew up in Auburn, ME and has spent the majority of his life in Maine. After graduating from St. Dominic Regional High School, he received a BS in Finance from Boston College and an MBA in Marketing from Bentley University. He has worked in various sales and marketing positions for Lepage Bakeries, Futures Search and Aflac during h
Mike grew up in Auburn, ME and has spent the majority of his life in Maine. After graduating from St. Dominic Regional High School, he received a BS in Finance from Boston College and an MBA in Marketing from Bentley University. He has worked in various sales and marketing positions for Lepage Bakeries, Futures Search and Aflac during his professional career. Mike has lived in upstate New York, Massachusetts, and New Hampshire, returning to Maine in 2003 to raise his family. Mike enjoys staying involved in the community through his participation as an ice hockey official, a baseball umpire and as the current President of the Maine Amateur Hockey Association. He has held various positions on the school board for St. Dominic Academy, as well as being an active member in other community organizations over the years. Mike has three grown children, Nicole, Matthew, and Justin, and has been married to his wife, Linda, for 30 years. In his spare time, he enjoys playing golf, barbequing, and spending time with his family and friends at his home on Taylor Pond.
Franchise Consulting
We partnered with the Franchise Brokers Association to provide better guidance to aspiring entrepreneurs. The collaboration offers access to diverse franchises, and our specialized matching process ensures finding the right franchise for our clients.
