Washingtonian Magazine - Top Agent, 2018, 2019
GCAAR - Gold Award Winner 2019
Member of Top Agent Network
National Association of Realtors Green designation
Washingtonian over 20 years and a real estate agent over 15 years
Specialty Historic Properties
American Humane Society
Supporter of John Eaton Elementary School
★★★★★"John is the consummate professional and an absolute joy to work with. I had never a property before, and John went above and beyond to advise me throughout the entire process. I was impressed with his ability to accurately predict unforeseen costs, timelines, and multiple other hidden issues. He did so much work before the property was listed that the entire process flowed very smoothly. In fact, I had multiple offers far above the asking price within 3 days of listing. John will be the first person I contact for my future real estate needs." - Caroline
★★★★★"We are writing this letter to convey our great satisfaction with our Realtor, John Mammano, who we hired to sell our home. John was particularly helpful to us in many ways. John provided us with an effortless and efficient real estate transaction, from our first meeting to the closing. He explained the process in great detail and because of his professional demeanor and knowledge of the real estate market we were confident in his skills and support. He often went the extra mile, specifically in coordinating the transaction while we were out of town and providing us with feedback including all items required for completion on the sellers checklist. John was readily available and able to answer any questions we had. Honestly, we do not know how we would have accomplished this without his help. We have no qualms about recommending John as a realtor who goes above and beyond to please his clients." - Ian & Fran
★★★★★"John is an amazing real estate agent. He assisted our family in securing a wonderful condo our son. addition to being highly professional, he is very affable and was able to work with inter-generational needs (two parents and one young adult). He was always available to show us places and chat with us about the pros and cons of each apt. Under the last stretch of a bidding up process, which can be stressful, John used his mild manner and professional strategies to accomplish a winning my son. He is the best, do not hesitate to use him. We look forward to working with him again in the future." - Lance, Marjorie & Mark
A Washington resident over 20 years and a real estate agent over a decade, John has built his business on referrals and returning clients who trust him his market expertise, attention to detail, and outstanding negotiation skills. John, going the extra mile his clients is the part of the sales process he enjoys most.
John credits his parents his dedication to hard work and entrepreneurial spirit. Thanks to his family’s construction and real estate investment businesses, he was raised with the notion that hard work, smart business decisions, and loving your job are the ingredients success.
John holds a Bachelor of Arts degree Political Science and a minor in Business Administration from Arizona State University. His years of working in corporate Finance and Project Management prepared him to seamlessly handle complex transactions in real estate.
John’s interests include renovation projects, design, and architecture. He takes inspiration from his travels through Argentina, Brazil, Costa Rica, England, France, Spain, Mexico, Italy, Czech Republic, and Hungary. As an animal lover, John is a supporter of The Humane Society.