Mark has been the most professional responsive agent. My wife and I couldn't be more happy on how smooth and pleasant home purchase process went. Mark has been the best far agent we have dealt with, he is very negotiable and helpful always keeping in touch with most recent information, he goes above and beyond. He's very knowable, my wife and I are very impressive and satisfy with our purchase. Mark will forever be highly recommended to our friends and family.… [Read full reviews on Zillow]

My wife and I first met Mark when he showed us a property in Coronado that we wanted to make an offer for. At that time we were working with another agent who was a friend of ours. However, the property we were interested in was 2.5 hours away so our regular agent wasn't able to show it to us. Mark contacted us and said he would showed us the property without even representing us. We bought that house and so when we were ready to purchase a second property in Coronado, Mark was the first agent we contacted. He expertly negotiated the deal where there were multiple offers and and the escrow closed smoothly. I highly recommend Mark. He is a very responsive, caring, professional and his extensive knowledge of Coronado will give any buyer or seller an advantage in any Real Estate transaction.… [Read full reviews on Zillow]

Mark was efficient and very responsive to our needs at every step of the process. He was always there when we needed him Mark even helped us rent the place as this is an investment property for us in the short run. I cannot say enough about the responsive service that Mark provided.… [Read full reviews on Zillow]

We are thrilled to share our wonderful experiences working with Mark O'Brien. Mark is one of the most professional, ethical, efficient, and responsive individuals we have had the pleasure to work with.We met Mark a few years ago, as first-time home buyers. Back then, he found us a beautiful home which was perfect for our family, in every way. He made the home buying process smooth and as stress-free as possible. We are now beginning a new chapter in our life, and needed to sell our home. Based on our prior experience as buyers, Mark was our first choice to represent us as sellers. Once again, he exceeded all of our expectations in every possible way, and made the sale smooth, expedient, and stress-free.We feel very fortunate to have met Mark and will always highly recommend him and his services. He is experienced, knowledgeable, highly ethical, professional, and prompt. Bringing utmost professionalism and integrity to every step of the process, Mark is the best real estate agent we could have hoped to work with. The results he delivered in both of our transactions exceeded our expectations, for which we will always be thankful.… [Read full reviews on Zillow]

We had inquired about viewing a home for sale through an online portal, and Mark reached out to us within less than a minute of our inquiry. He made a wonderful first impression on us which only became further reinforced throughout our collaboration in our home search. Mark is so prompt, professional, and knowledgeable, and is a delight to work with. We knew right away that we wanted him to represent us in our home search, and were very comfortable with trusting him to guide us through the process. The ultimate result was that with Mark's help, we found the absolute prefect home, a gem which we love! If we could buy homes all the time, we would choose him as our agent in each transaction. We will always highly recommend Mark; he is wonderful!… [Read full reviews on Zillow]

Mark, was very easy to work with and quick to respond to questions. While we were waiting on this property he was always looking for other options to help us out. Once the seller accepted our offer he kept us updated each step of the way. He also knows the island and the amenities very well.… [Read full reviews on Zillow]

Mark was great! Extremely helpful throughout the whole process. Always pleasant, available, and knowledgeable. I would recommend him to my friends and family.… [Read full reviews on Zillow]

Mark was ALWAYS available to show home tours or answer my questions. I can't ask for better responsiveness and professionalism. I purchased a condo for my son, which wasn't a straightforward process because of family and legal issues. However, he responded to my concerns. researched what he wanted to do, and ensured the issues were addressed. He treated it like he was purchasing the property. I've already recommended him to my good friends. I will not hesitate to call Mark when I am looking to buy again.… [Read full reviews on Zillow]

I just closed on a condo downtown San Diego yesterday. The best way to describe the experience was "flawless". I am real estate attorney and own multiple properties. I am therefore intimately familiar with the process and the documents. This, however, can make me a bit of a demanding client. Mark's work product was impeccable. He was the consummate professional, on point, on time, and had great insights on all deal points. I will be using him on all deals going forward.… [Read full reviews on Zillow]