Our Team · Northern Virginia + Washington, DC
CORNERSTONE
REALTY GROUP
Real Estate Is Personal.
Our Approach Is Too.
Cornerstone Realty Group is a Northern Virginia and Washington, DC real estate team built around thoughtful strategy, personal service and hands-on execution from the first conversation through closing.
Co-founded by Kareem Yousef & Mary Machaiel RealTrends Top 1.5% Team
250+
Families Served By Our Team
Collective closings across Northern Virginia + DC since 2019.
$100M+
Team Sales Volume
Team-level production, not individual attribution.
★★★★★ 5.0
Google Rating
Team rating. God, Family, Business.
Why Cornerstone Exists
Cornerstone Realty Group was co-founded by Kareem Yousef and Mary Machaiel around a shared approach to real estate: personal service, strong preparation, clear communication and hands-on execution.
We started the team because clients deserved more than portal-driven advice and checklist management. We built Cornerstone to treat a $700k home with the same preparation, media, and strategy as a luxury listing — because how you go to market matters regardless of price point.
How Cornerstone Serves Clients
01
Listen First
We start with your timeline, motivation, and non-negotiables — not a script.
02
Prepare Strategically
Pricing built on comps and market behavior, media, pre-market testing.
03
Execute Hands-On
We manage staging, marketing, showings, offers, negotiations personally.
04
Communicate Clearly
Weekly updates, early problem solving, direct access to your agent.
Different Execution
What Makes Cornerstone Different
Boutique Prep
Every listing gets media day, staging direction, and strategic launch — not just a lockbox and photos.
Team Coverage
Six REALTORS® means showings get covered, calls answered, nothing slips.
Local Depth
We track blocks, HOAs, and boundaries portals miss — pricing hits real-time behavior.
Meet The Founders
Kareem Yousef
Co-Founder & Team Leader
Co-founder & Team Leader. Co-founder & Team Leader. Active investor helping clients think beyond the home — value, equity, resale, and wealth building.
View Profile →Mary Machaiel
Co-Founder
Co-founder. Co-founder. Helping clients start their real estate journey with confidence — first home, forever home, or investment portfolio.
View Profile →Meet The Team · 6 REALTORS®
Cornerstone is a real organization — not Kareem + supporting people. Six REALTORS® who cover showings, manage files, and execute together.
Kareem Yousef
Co-Founder & Team Leader
In Their Own Words · Why They Do This Work
Every agent on this team answered the same question: what's your favorite part of helping families? Here's what they said.
"Watching a client make a confident, well-informed move — whether it's their first home or their next investment — because they understand the numbers behind it."
"What means the most to me is building relationships based on trust, honesty, and genuine care. I don't just want to help families buy a house — I want to help them build a home, create memories, and take a step toward financial security and a better future."
"My favorite part of helping families is easing the stress of the real estate process by being a reliable, knowledgeable resource they can trust and lean on."
"My favorite part is seeing the excitement when everything finally comes together. I love helping people turn a big decision into a clear plan, finding the right solution, and being there from the first step to the moment they get the keys."
"Handing someone the keys and knowing I helped them make a smart move, not just any move."
What We Do
Buyers
Strategic search, comps, escalation and appraisal-gap guidance.
Sellers
Preparation, pricing, media, pre-market testing, launch strategy.
Investors
Rental analysis, renovation scope, hold/sell guidance.
Landlords & Rentals
Leasing strategy, tenant placement, property guidance.
Our Values
God. Family. Business.
God
How we do business is ministry. Integrity first, even when it costs us.
Family
We treat clients like family — patience, protection, guidance that serves your timeline.
Business
Execution matters. Preparation, pricing, negotiation — done right, every time.
Work With Cornerstone
Real Estate Is Personal.
Our Approach Is Too.
Northern Virginia + Washington, DC. Boutique team, personal execution, team coverage from first call to closing.
★★★★★ 5.0 · (571) 441-1031 · homes@cornerstonedmv.com