Working alongside Mariah Cosio has been nothing short of a privilege. In this industry, you quickly learn who simply does the job, and who truly lives it. Mariah lives it. She is incredibly professional, persistent, and relentlessly hardworking. When she takes on a client, she doesn't just represent them; she genuinely loves on them. She advocates fiercely, communicates clearly, and shows up with consistency and care every single time. Her follow-through is strong, her standards are high, and her integrity is unwavering. As an agent myself, I deeply value collaboration and professionalism, and Mariah is the type of agent who elevates every transaction she's part of. She's organized, solutions-oriented, and always moving forward with purpose. More importantly, she leads with heart; and that's something you can't teach. If you have the opportunity to work with Mariah, whether you're buying, selling, or collaborating alongside her, know that you're in steady, capable, and compassionate hands. She is truly a pleasure to work with and an incredible advocate for her clients. read more

Wowwww! Amazing lady helped my family and I purchase multiple homes. She's our go to realtor.Mariah is an agent I'd recommend to anyone in the market to buy or sell a home read more

Mariah went above and beyond to find us our home. She was always available for our 101 questions and gave us honest feedback on houses and areas to look at. She stayed focus on our price range and style of home we were looking for. I would recommend her to everyone looking for a home. She's amazing!! read more

Mariah Cosio - Re/Max Top Producers - Real Estate Agents Near Me - Diamond Bar, California

Mariah truly is the best! For years we have dreamed of becoming homeowners and even attempted to buy about a year ago unfortunately with a different realtor who did not put even just a bit of effort in comparison as to what Mariah has done for us. We are true believers in gods timing because it is why we came across Mariah who put in the true time and effort in making our dream a reality, despite the crazy market. We highly recommend her! read more

Mariah Cosio - Re/Max Top Producers - Real Estate Agents Near Me - Diamond Bar, California

Mariah was absolutely a delight to work with. I am a real estate broker but I knew I needed someone that was an expert in the field of commercial real estate to help us find the perfect location for our business and Mariah was definitely the one. She worked day and night to not only find our location but she negotiated the best terms possible. Mariah you are absolutely a Gem, and If anyone is looking for the best commercial realtor trust me Mariah is the one and you don't have to search anymore . read more

being first time homeowners you have no idea what to expect and are not quite knowledgeable when it comes to the housing market , so she educated us through every step of our home process . She was very patient with me & assured me we'd find out home & sure enough 5 months later we are officially home owners! Thank you Miriah for providing us with the best experience read more

Mariah Cosio - Re/Max Top Producers - Real Estate Agents Near Me - Diamond Bar, California

My business partner and I had a wonderful experience with Mariah, she is the best RE Agent I have ever dealt with. Mariah was able to negotiate a lease that benefited us and our new business. Mariah guided us with every step, making it stress free, quick and easy. I highly recommend Mariah for all your Real Estate needs. Thank you again Mariah. read more

Nowadays REVIEWS can be found on pretty much anyone and sharing these makes it easier to CHOOSE the right person so I'm writing the review to help others.. Mariah just negotiated a headache of a lease for me and pretty much got me everything I wanted in the process. I don't know how familiar people are in the process of FINDING AN OFFICE TO PUT YOUR BUSINESS IN is but it's draining. The owner of the building is COUNTING ON the tenant to go in representing themselves. There are terms like Tenant Improvements (T/I), "CAM", "Triple Net", etc.. EVERYTHING IS NEGOTIABLE! I've made the mistake of representing myself before and wanted to try the EXPERT Mariah out because she was a friend. Contrary to what some say about doing business with friends I knew she had the knowledge just by hearing her conversation with other clients and seeing the OUT OF THE WAY attitude she has when it comes to getting what she believes she can for US (the VALUED client). I'm glad I did! If you're looking for commercial space and need a smart, assertive, workaholic she's your girl. I own a financial franchise and will be counting on her to negotiate the terms of all our future leases because of the EFFORT and EXPERTISE she displayed in getting me the right deal! I hope this helps in whomever's reading to lean in her direction and made it as descriptive as possible for that reason. Respectfully... read more

Mariah is such a hard working women, she will do anything in her power to make your dreams come true! We can't thank her enough for what she has done for us, I will Highly recommend her to my family friends & anyone who is trying to buy there first home! She is absolutely amazing!! Thank you so much Mariah! read more

Mariah Cosio - Re/Max Top Producers - Real Estate Agents Near Me - Diamond Bar, California

If I could give more stars I would!! Mariah went above and beyond to ensure that I found the perfect location for my business. She got me into the space I had hoped and dreamed for! I was nervous initially but she assured me that she could work a deal of a lifetime. She followed through 110% and made my dreams a reality. Thank you Mariah for everything you are the best!! read more

All I have to say is we got our keys!!! All to the amazing help Mariah has provided for us. Hands down such an amazing person and she went above and beyond to find us what we where looking for! If any one is trying to buy in this crazy market Mariah is definitely fit for the job. We never thought we where going to be homeowners with all this going on but Mariah made our dreams come true. But being a first time home buyer and with a lot of doubts Mariah made sure we where explained everything from the beginning to the end. Very committed and awesome communication, she didn't hesitate to answer any question we had. So look no further Mariah will get the job done! read more

Mariah Cosio - Re/Max Top Producers - Real Estate Agents Near Me - Diamond Bar, California

Mariah is amazing!!! I was looking to purchase my first home for nearly 8 months before we met. I decided to contact Mariah after a friend recommended her. She was on top of it from day 1. She is very knowledgeable and resourceful. She taught me a lot about the home buying process and was always looking out for my best interest, while helping me be realistic at the same time. We found the perfect home for me within 2 months and I couldn't be happier. If you are looking for a hard working, responsive, and knowledgeable realtor I highly recommend Mariah! read more

Mariah had the most patience throughout the transaction and did not give up in finding what I wanted..would def recommend her to anyone in the future! read more

Mariah is the best there is at what she does! She is incredibly fast, efficient, and was able to answer all the questions I had as a first-time homebuyer. Four days after first contacting her she was already able to show me potential homes, and soon after that, we began submitting offers. It wasn't even a full week before Mariah put together an offer and letter that beat out nearly forty other contenders for my new home. Everyone I spoke to told me it would be a long time -- three, four, even five months -- before I found a home I liked and closed on it. With Mariah, it was less than a month. I cannot emphasize enough how helpful she was throughout this whole process, and how often she checked in to reassure me everything was going just as planned. When anyone asks me who they should go with for a realtor, I will without a doubt send Mariah their way. read more

My family and I had a great experience working with Mariah. She was knowledgeable, very hard worker, quick, responsive. She worked very hard getting us what we were looking for, for our growing family. We would definitely recommend her and will definitely be working with her in any future purchases. read more

Writing this review isn't easy for me to do because you can never find the right words on how to express your feelings about being a 1st time buyer for a new home but here we go. This experience has opened my eyes completely to a different setting. My agent Mariah Cosio is definitely a blessing and I am Very grateful we came across one another. I can truly call her not just my agent but a great friend and a motivator. What she did for me is something I think I wouldn't experience with someone else. She went above and beyond for me and my family. After almost a year of looking for a home she got me into the home of my dreams. She showed me so many homes until I finally got into the home I originally fell in love with. Everyday she would call email text and even went above and beyond of making sure I had all the right information I needed to make a financial and wise decision for a home in today's market. If you need or want someone that's passionate motivated loving and cares for your wants and needs then make sure you get her on your side. She and her team was so great to work with and definitely I'm a customer of hers for life. Thank you so much for everything you did and I can't express how much this means to me to get me into a home that I love and cherish on a daily basis. read more

Mariah is the best agent! She help me find my commercial property lease for my gym! She's very responsive and always working hard

Mariah has been a tremendous help with my moving process. She's been extremely patient from beginning to end and catered to my every need. She took the time and showed me every house I was interested in and not once did I ever feel rushed. Thank you Mariah for being so professional and I hope others get the opportunity to work with you in the future! read more

Super glad we had the chance to have Mariah as our realtor, the presses of buying a home isn't easy and she did everything in her power to make it as smooth as possible. Also made sure we found the right home for us, we couldn't be happier!! read more

Mariah Cosio is just the best, you be so happy to met her in person because she is such an amzing person she will guide you and take care of whatever you need in the most professional and trustworthy manner. What I really Like about Mariah other than her smile and personality is that as an stranger coming into your life to help you deal with something so stressful and personal she just straightaway made us feel relaxed and confident and I trusted her. She really just wants to help people and she is just a lovely person, and I would highly recommend her to anyone with any kind of real state needs. We also find a new friend in her. She was such a great agent to work with we really got the attention we needee on her trying to buy our first home we saw Tons of houses usually more than once and Mariah was always willing to come check them out with us and give great advice on choosing our first home read more