What is Your Property Worth?

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523 SW 7th Ave, Miami, FL 33130

Your Estimated Home Value!

$291,000 (Low End)
$407,000 (Your Home)
$523,000 (High End)

The valuation date of this estimate is 12/28/2020. The property value presented is an estimate based on public record data and other factors. The actual value of the property may vary.

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Who am I?

David Koster PA

Executive Vice President

Licensed Real Estate Broker

ONE | Sotheby's International Realty

Member Master Brokers Forum

David's formal education in Management Information Systems together with his technical acuity and business acumen have allowed him to excel in the real estate industry.

David founded Penthouselife.com™, the largest online marketplace for penthouses around the world. The website is responsible for millions of dollars in penthouse sales including a record-breaking $21M penthouse sale at the Ritz-Carlton™, Sunny Isles Beach.

In 2011, David founded Decorus Realty and led his boutique brokerage firm with 150+ real estate agents to over $1.5B in residential, commercial, and new development sales before selling the company to ONE Sotheby's International Realty in 2020. Having developed his own multifamily project, operated his own brokerage for 10 years, brokered multimillion dollar residential and commercial transactions, and invested in real estate, David has uniquely rounded off his first-hand experience in all aspects of the real estate business and its many complexities and pitfalls.

Due to his personal market leading sales volume and his commitment to the highest ethical values, David has been inducted as a member of South Florida’s most elite broker’s association, The Master Brokers Forum and recognized by both ‘Who’s Who’ in Miami Agent Magazine and ‘People On The Move’ in the South Florida Business Journal. David has also been featured in The Real Deal, The South Florida Business Journal, Aventura Magazine, Haven Lifestyles and the duPont Registry.

In his spare time, David also serves on the Advisory Board of Realdax, a disruptive real estate software and services company.

Unique Experience

  • Engaged in the real estate industry for over two decades, serving as a Realtor and also a licensed Real Estate Broker for the past 16 years.
  • Established and operated a real estate brokerage firm, guiding a team to achieve sales exceeding $1.5 billion, culminating in the company's acquisition by Sotheby’s in 2020.
  • Acquired extensive experience as the managing broker for 150 sales agents over nearly a decade by addressing daily agent inquiries, facilitating conflict resolution, negotiating transactions, and cultivating a nuanced understanding of market dynamics and trends.
  • Spearheaded the development of a 20,000 square foot luxury townhome project, demonstrating proficiency in project management and execution.
  • Provided comprehensive support to various developers through market analysis, sales strategy formulation, and marketing initiatives.
  • Advised commercial investors, demonstrating adeptness in due diligence processes, market assessment, and pro forma financial modeling.
  • Possess specialized expertise spanning over twenty years in the acquisition, sale, and brokerage of preconstruction condominium residences. FAQ
  • Established http://Penthouselife.com, the premier online marketplace for penthouse properties, catering to a discerning clientele.
  • Executive Vice President within the renowned global luxury real estate firm; Sotheby’s.


  • Bachelor of Business Administration in Information Systems, BBA-IS
  • Licensed Real Estate Broker and Realtor, DBPR
  • Accredited Buyer's Representative, (ABR®)
  • Real Estate Negotiation Expert Certification, (RENE)
  • Master Brokers Forum member, MBF

As a result of his unparalleled sales achievements and unwavering adherence to ethical standards, David has been honored with membership in South Florida's esteemed Master Brokers Forum, an elite association of top-tier brokers. Furthermore, he has garnered recognition from prominent publications such as 'Who's Who' in Miami Agent Magazine and 'People on The Move' in the South Florida Business Journal. David's expertise has been highlighted in esteemed industry publications including The Real Deal, The South Florida Business Journal, Aventura Magazine, Haven Lifestyles, and the duPont Registry.

About Sotheby's

The Sotheby’s International Realty® brand is built on the centuries-long prestige of the world’s preeminent auction house. Sotheby’s history and our unmatched reputation give our listings the best-in-class exposure they deserve and assures buyers they are working with a trusted partner. Established in 1976, Sotheby’s International Realty has become the world’s premier luxury residential real estate brokerage. Through our vast global footprint, local expertise, and unequalled referral network, we ensure that the properties we represent receive the far-reaching and unparalleled exposure they deserve.

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