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William Hartmann

William Hartmann
Real Estate Agent (Associate Broker)
Franklin Square NY

Associate Broker (NY: 30HA0856907)

29 years experience

REALTOR® 1 Active Listings Serves Nassau County, NY
View on Realtor.com

Contact Information

Brokerage
Franklin Square

Office Website
Office Address
390 Franklin Ave
Franklin Square, NY  11010
(Nassau County)
Office Phone
516-354-6500
Office Fax
Mobile
516-841-1146
Email
will************@*******.com
Show Email for $5

Service Areas

Garden City South: NY Franklin Square: NY Malverne Park Oaks: NY Hewlett Harbor: NY East Rockaway: NY Bay Park: NY Oceanside: NY Village of Garden City: NY Garden City: NY Uniondale: NY Stewart Manor: NY Rockville Centre: NY Lakeview: NY West Hempstead: NY Hewlett Bay Park: NY Hewlett: NY Woodmere: NY North Lynbrook: NY Lynbrook: NY Malverne: NY South Hempstead: NY Baldwin: NY Valley Stream: NY North Valley Stream: NY South Valley Stream: NY Woodsburgh: NY Hewlett Neck: NY

About William Hartmann

Welcome to Long Island, where the journey to finding your ideal home often begins with a focus on proximity to New York City. For many, this means exploring the vibrant communities of Western Nassau County. Towns such as Valley Stream, Lynbrook, Rockville Centre, East Rockaway, North Woodmere, Woodmere, Woodsburgh, Cedarhurst, Lawrence, and The Hewletts (including Hewlett, Hewlett Harbor, Hewlett Bay Park, and Hewlett Neck) offer convenient commuting options while embodying the quintessential Long Island lifestyle. These areas are not only home to excellent schools and cultural institutions but also feature a diverse array of dining and shopping experiences, as well as access to beautiful parks and beaches. Families can find unparalleled opportunities to cultivate a suburban lifestyle tailored to their unique needs.

William is a dedicated real estate professional with over 15 years of experience assisting buyers and sellers in Nassau and Queens Counties. His extensive knowledge of the local market, combined with strong community connections, provides clients with invaluable support and confidence when navigating the complexities of real estate transactions.

Clients appreciate his commitment to going above and beyond. One client remarked, "I am especially grateful for the extra efforts you made on our behalf. The challenges we faced were daunting, especially from a distance, but I always knew I could rely on you to handle everything."

Nassau County, NY Real Estate Market Analysis (Single Family Homes)

$1,425,813
Avg. Listing Price
From William's portfolio
4.1 / 3.0
Avg. Beds/Baths
Typical property size
2,471 sf
Avg. Square Footage
Interior living space
3105
Active Listings
Current inventory

Nassau County's real estate market represents one of New York's most dynamic and valuable suburban landscapes, with properties consistently ranking among the highest-priced in the nation. This Long Island powerhouse attracts buyers seeking premium coastal living, top-tier school districts, and convenient Manhattan access, creating a marketplace where million-dollar homes are commonplace and inventory moves quickly despite premium pricing.

The county's real estate ecosystem supports 11,944 total actively licensed agents, with all 11,944 agents maintaining email contact information, reflecting the market's technological sophistication and professional connectivity. This robust agent network serves diverse communities from Hempstead's affordable starter homes to Old Westbury's sprawling estates, each requiring specialized market knowledge and relationship management.

Major Nassau County, New York Real Estate Markets

The Gold Coast communities of Manhasset, Port Washington, and Roslyn dominate Nassau's luxury segment, where historic estates and waterfront properties command prices exceeding $3 million. Meanwhile, established neighborhoods like Garden City, Rockville Centre, and Westbury offer premium suburban living with strong resale values, while emerging markets in Freeport and Uniondale present opportunities for first-time buyers and investors seeking appreciation potential.

Nassau's geography creates distinct micro-markets along the North Shore's prestigious waterfront communities versus the South Shore's beach-adjacent neighborhoods like Long Beach and Atlantic Beach. Each region maintains unique pricing dynamics, with proximity to transportation hubs like the Long Island Rail Road stations significantly impacting property values and market velocity throughout communities from Great Neck to Hicksville.

Market Dynamics and Geographic Complexity

Nassau County's real estate market operates on compressed inventory cycles, where desirable properties in sought-after school districts like Jericho or Syosset often receive multiple offers within days of listing. This competitive environment demands agents who understand hyperlocal nuances, from flood zone implications in waterfront areas to the impact of property taxes that can exceed $30,000 annually on premium homes.

The market's complexity extends beyond pricing to encompass co-op buildings in communities like Great Neck Plaza, new construction developments in previously industrial areas, and the ongoing conversion of larger estates into luxury subdivisions. These varied property types require agents with specialized expertise in everything from co-op board approval processes to new construction warranties and municipal approval procedures.

Why Businesses Need Nassau County, New York Agent Contact Data

Mortgage lenders, home inspection companies, and luxury service providers targeting Nassau County's affluent market need direct access to the county's extensive agent network to capture high-value transactions. With average home prices significantly exceeding national norms, each successful business relationship with local agents can generate substantial revenue through premium-priced services and repeat referral opportunities.

Technology companies, marketing firms, and financial services businesses benefit from connecting with Nassau's digitally-connected agent community to introduce innovative tools and services. Given the market's competitive nature and sophisticated clientele, agents actively seek resources that provide competitive advantages, creating opportunities for B2B companies offering everything from virtual staging software to client management platforms and investment analysis tools.

Current Property Listings

As of 2/13/2026, William Hartmann has 1 property for sale in Franklin Square and surrounding areas.

$225,000

Listed 2025-08-01

1205 E Broadway Apt F13
Hewlett, NY  11557

Beds: 2.0
Baths: 1.0
Sq Ft: 950
Coop Map
View Full Details

Current Property Rentals

William Hartmann currently has no rental properties available in Franklin Square and surrounding areas. Check back later.