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Margaret Costello

Margaret Costello
Real Estate Agent (Broker)
Downers Grove IL

Broker (IL: 475143557)

16 years experience

REALTOR® 1 Active Listings Serves Dupage County, IL
View on Realtor.com

Contact Information

Brokerage
@properties Downers Grove

Office Website
Office Address
5002 Main St Ste 4
Downers Grove, IL  60515
(Dupage County)
Office Phone
630-241-0800
Office Fax
Mobile
630-391-1991
Email
p**@************.com
Show Email for $5

Service Areas

Glen Ellyn: IL Downers Grove: IL Lombard: IL Villa Park: IL Oakbrook Terrace: IL Westmont: IL Naperville: IL Plainfield: IL Romeoville: IL Warrenville: IL Aurora: IL Woodridge: IL Bolingbrook: IL Chicago: IL Lisle: IL Westchester: IL Oak Brook: IL Fox Valley: IL Hillside: IL Elmhurst: IL Berkeley: IL Northlake: IL Wheaton: IL Winfield: IL

About Margaret Costello

Peggie Costello was recognized in the 2021 edition of Chicago Agent Magazine's "Who's Who in Chicagoland Real Estate." In 2020, she earned accolades as a top producer from the Mainstreet Board of Realtors, ranking in the top 3% among over 18,000 agents based on sales volume.

With a decade of experience, Peggie is a driven Realtor known for her commitment to delivering exceptional customer service. Her reputation is built on effective communication, guidance, and maintaining confidentiality. Peggie specializes in the real estate markets of Naperville, Downers Grove, Glen Ellyn, Lisle, Lombard, Villa Park, Wheaton, and the surrounding suburbs. As a long-time resident of Naperville and a parent who raised her family there, she possesses an in-depth understanding of the local area.

Peggie holds several professional designations, including Certified Staging Consultant, Sellers Representative Specialist, Pricing Strategy Advisor, and Certified Negotiations Consultant. Both buyers and sellers trust her expertise in strategically positioning homes for sale and negotiating effectively on their behalf.

Recently, Peggie joined @properties to enhance her clients' experiences through advanced technology, marketing strategies, and robust brand support. She is dedicated to providing top-tier representation and has a reliable network of service partners, including lenders, attorneys, and inspectors, to assist her clients. Understanding that knowledge is power, Peggie ensures that all parties are well-informed throughout the process, embodying a client-first philosophy.

To explore how Peggie Costello can assist you in achieving your real estate objectives, or to inquire about the latest property listings, please reach out to her directly.

Dupage County, IL Real Estate Market Analysis (Single Family Homes)

$810,715
Avg. Listing Price
From Margaret's portfolio
3.7 / 3.1
Avg. Beds/Baths
Typical property size
2,679 sf
Avg. Square Footage
Interior living space
1402
Active Listings
Current inventory

DuPage County, Illinois stands as one of the most robust and sophisticated real estate markets in the Chicago metropolitan area, with 7,630 actively licensed agents working across its diverse communities. This substantial agent population reflects the county's economic vitality and the complexity of its housing landscape, which spans from luxury suburban enclaves like Hinsdale and Oak Brook to rapidly growing communities such as Naperville and Wheaton.

The county's real estate market benefits from its strategic position as both a major employment hub and a desirable residential destination. With all 7,630 licensed agents maintaining active email contacts, the market demonstrates a high level of digital engagement and professional connectivity that facilitates efficient transactions across price points ranging from starter condos in Glen Ellyn to multi-million dollar estates in Burr Ridge.

Major Dupage County, Illinois Real Estate Markets

Naperville dominates as the county's largest real estate market, consistently ranking among Illinois' most desirable cities for families and professionals. The city's excellent school districts and corporate headquarters presence drive sustained demand, while nearby Downers Grove and Lombard offer more affordable alternatives with similar amenities. Aurora's western sections within DuPage County represent emerging growth areas, particularly appealing to first-time homebuyers seeking value.

The eastern communities of Elmhurst, Villa Park, and Addison benefit from exceptional transportation access to downtown Chicago, creating distinct micro-markets with varying price dynamics. Westmont and Clarendon Hills have emerged as hidden gems for buyers seeking walkable downtown areas, while Lisle attracts technology professionals due to its proximity to the Illinois Technology and Research Corridor.

Market Dynamics and Geographic Complexity

DuPage County's real estate market exhibits remarkable resilience due to its economic diversification, with major employers in healthcare, technology, and finance providing stable demand across multiple price segments. The county's 28 municipalities each maintain distinct character and pricing structures, from the historic charm of Glen Ellyn to the modern corporate environment of Oak Brook, requiring agents to develop specialized local expertise.

Surprisingly, the county's western edge communities like Carol Stream and Glendale Heights have experienced some of the strongest appreciation rates in recent years, as buyers discover excellent value propositions. The market also shows increasing interest in townhome and condominium developments, particularly in Wheaton and Wood Dale, as demographics shift toward lower-maintenance living options.

Why Businesses Need Dupage County, Illinois Agent Contact Data

Real estate service providers, from mortgage lenders to home improvement contractors, require comprehensive agent contact databases to effectively reach DuPage County's extensive network of 7,630 professionals. The county's high transaction volume and affluent client base make it particularly attractive for luxury service providers, property technology companies, and financial services firms seeking to establish meaningful business relationships with active agents.

Marketing professionals and B2B service companies benefit significantly from having verified email contacts for all licensed agents, enabling targeted campaigns for continuing education, professional services, and real estate technology solutions. Given the county's sophisticated market dynamics and high average transaction values, businesses that successfully connect with these agents often see substantial return on investment through sustained professional partnerships.

Current Property Listings

As of 1/15/2026, Margaret Costello has 1 property for sale in Downers Grove and surrounding areas.

$312,000

Listed 2025-12-01

0N670 Bedford Ln Unit 2304
Winfield, IL  60190

Beds: 2.0
Baths: 2.0
Sq Ft: 1,550
Townhomes Map
View Full Details

Current Property Rentals

As of 2/15/2026, Margaret Costello has the following rental property available in Downers Grove and surrounding areas.

$2,500

Listed 2025-10-01

2965 Stockton Ct Unit 2965
Naperville, IL  60564

Beds: 2.0
Baths: 2.0
Sq Ft: 1,142
Condos Map
View Full Details