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John L Costello

John L Costello
Real Estate Agent (Broker Sales)
Miami FL

Broker Sales (FL: 3285902)

13 years experience

REALTOR® 1 Active Listings Serves Miami-Dade County, FL
View on Realtor.com

Contact Information

Brokerage
Keller Williams Realty Premier

Office Website
Office Address
11111 Sw 120 St
Miami, FL  33176
(Miami-Dade County)
Office Phone
305-595-2844
Office Fax
786-433-2955
Mobile
305-714-2122
Email
cost*****@*********.net
Show Email for $5

Service Areas

Miami: FL Coral Gables: FL Glenvar Heights: FL Kendall: FL South Miami: FL Olympia Heights: FL Sunset: FL Kendale Lakes: FL Richmond Heights: FL The Hammocks: FL The Crossings: FL Country Walk: FL Three Lakes: FL Palmetto Bay: FL Pinecrest: FL Gables By The Sea: FL Village of Palmetto Bay: FL Richmond West: FL Goulds: FL Quail Heights: FL South Miami Heights: FL Perrine: FL Palmetto Estates: FL Cutler Bay: FL West Perrine: FL Cutler Ridge: FL Homestead Base: FL Naranja: FL Leisure City: FL Princeton: FL Homestead: FL Key Biscayne: FL

About John Costello

With its stunning beaches, vibrant lifestyle, and diverse business opportunities, Miami has become a sought-after destination for both residents and investors. John Costello brings over 20 years of expertise in management, rentals, and sales to the Southern Florida real estate market, making him a trusted advisor for those looking to realize their real estate aspirations.

Whether clients are searching for their ideal home, exploring investment properties, or considering renovation projects, John and his team possess the knowledge, resources, and negotiation skills necessary to navigate the complexities of the market. Their meticulous attention to detail ensures that each client's needs are prioritized, with a commitment to fulfilling every requirement on their wish list.

When you are ready to embark on your next real estate journey, trust The Costello Group at Keller Williams Realty to serve as your dedicated fiduciary in Miami, FL.

Miami-Dade County, FL Real Estate Market Analysis (Single Family Homes)

$2,019,764
Avg. Listing Price
From John's portfolio
3.8 / 3.0
Avg. Beds/Baths
Typical property size
2,338 sf
Avg. Square Footage
Interior living space
8091
Active Listings
Current inventory

Miami-Dade County stands as one of Florida's most dynamic and complex real estate markets, driven by international investment, luxury developments, and diverse demographic shifts. The market encompasses everything from ultra-luxury waterfront properties in Fisher Island to emerging neighborhoods in Homestead, creating opportunities across every price point and property type. With 86,095 total actively licensed agents operating throughout the county, the market demonstrates both robust activity and intense competition among real estate professionals.

What makes Miami-Dade particularly fascinating is its role as a gateway between Latin America and the United States, attracting cash buyers from across the Americas and Europe. This international influence creates pricing dynamics rarely seen elsewhere, where luxury condominiums in Brickell can command Manhattan-level prices while single-family homes in Kendall offer more traditional suburban value propositions.

Major Miami-Dade County, Florida Real Estate Markets

The county's real estate landscape divides into distinct geographic markets, each with unique characteristics and buyer profiles. Downtown Miami and Brickell represent the urban luxury segment, featuring high-rise condominiums and modern developments that attract international investors and young professionals. Miami Beach, including South Beach and Mid-Beach, commands premium prices for its iconic Art Deco architecture and oceanfront properties, while Coral Gables maintains its reputation for Mediterranean Revival estates and family-oriented neighborhoods.

Suburban markets like Kendall, Doral, and Aventura cater to families seeking newer construction and planned communities, often with excellent schools and amenities. Meanwhile, emerging areas such as Little Haiti, Overtown, and parts of Homestead are experiencing gentrification and development pressure, creating opportunities for both investors and first-time homebuyers. Each submarket operates with different pricing mechanisms, buyer expectations, and seasonal patterns.

Market Dynamics and Geographic Complexity

Miami-Dade's real estate market operates on multiple seasonal cycles simultaneously, influenced by snowbird migration patterns, international tourism, and hurricane season considerations. The luxury market peaks during winter months when wealthy buyers from colder climates make purchasing decisions, while family-oriented neighborhoods see more consistent activity year-round. Cash transactions represent a significantly higher percentage of sales compared to national averages, particularly in luxury segments where international buyers predominate.

Geographic complexity adds another layer of market sophistication, as flood zones, hurricane risk assessments, and sea-level rise concerns increasingly influence property values and insurance costs. Properties in Pinecrest command different risk profiles than those in Key Biscayne, while inland communities like Doral offer different value propositions than barrier island locations. These factors create micro-markets within the broader county, each requiring specialized knowledge and expertise.

Why Businesses Need Miami-Dade County, Florida Agent Contact Data

The concentration of 86,095 actively licensed agents with email contact information represents an enormous business opportunity for service providers, technology companies, and financial institutions. These agents handle billions in transaction volume annually and require everything from marketing services and lead generation tools to continuing education and professional development resources. The international nature of Miami-Dade's market means agents often need specialized services for currency conversion, international wire transfers, and cross-border tax planning.

Companies offering property management software, virtual tour technology, translation services, and luxury marketing solutions find particularly receptive audiences among Miami-Dade agents. The competitive nature of the market drives agents to adopt new technologies and services that provide competitive advantages, making this agent database valuable for businesses seeking to expand their presence in one of America's most sophisticated real estate markets.

Current Property Listings

As of 2/13/2026, John Costello has 1 property for sale in Miami and surrounding areas.

$10,900,000

Listed 2025-12-19

6750 Granada Blvd
Coral Gables, FL  33146

Beds: 5.0
Baths: 4.0
Sq Ft: 5,704
Lot: 20,909 sf
Single Family Map
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Current Property Rentals

As of 1/31/2026, John Costello has the following rental property available in Miami and surrounding areas.

$3,500

Listed 2025-11-03

11031 SW 43rd St
Miami, FL  33165

Beds: 3.0
Baths: 2.0
Sq Ft: 1,698
Lot: 7,405 sf
Single Family Map
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