Mary Slay

Responds Quickly

St. Louis MO

Dielmann Sotheby's International Realty

48 Closed Sales

$42.9M Total Value

$325K - $2.3M Price Range

$894.8K Average Price

Prior 5 years

About Mary

As an accounting professional and a product manager, Mary has a deep background in training, management, analytics, and promotions. Her success as a Realtor is built upon an exceptional understanding of trends, details, and processes that engenders loyalty and confidence with buyers, sellers, and colleagues alike.

Mary is an enthusiastic people person who listens with interest and intensity. She has a flair for esthetics and is always able to perceive both the style possibilities and the fit for customers. A workaholic by nature, she is creative, tireless, and thorough, but her warm easy smile and sense of humor will rule the day when it comes to working well with others and tackling the details. Mary is a super-star realtor!

Home Types: House, Townhouse, Condo

Years of Experience: 7

Education: Associate of Arts Degree from Southwestern Illinois College

Transaction History

1 Year
2 Year
5 Year

Seller Deals
Total Deals	4
Total Value	$2,151,000
Average Sale Price	$537,750
Price Range	$365K - $606K

Buyer Deals
Total Deals	4
Total Value	$4,950,000
Average Sale Price	$1,237,500
Price Range	$365K - $2.3M

Seller Deals
Total Deals	6
Total Value	$4,188,350
Average Sale Price	$698,058
Price Range	$325K - $1.7M

Buyer Deals
Total Deals	4
Total Value	$4,950,000
Average Sale Price	$1,237,500
Price Range	$365K - $2.3M

Seller Deals
Total Deals	26
Total Value	$25,448,745
Average Sale Price	$978,798
Price Range	$230K - $2.3M

Buyer Deals
Total Deals	22
Total Value	$17,499,812
Average Sale Price	$795,446
Price Range	$120K - $2.3M

5 Year View

Neighborhoods Mary is Experienced In

Mary's Active Listings

$1,700,000
- 6 Beds
- 6 Baths
- 7,730 Sq Ft
19348 Deer Pointe Estates Dr

Glencoe, MO
Some places are seen. Others are experienced. Ten private acres. One extraordinary estate. Rare 10-Acre Classic American Estate in the Heart of Wildwood - offering unparalleled privacy, acreage, lake views, room for multigenerational living, and an exceptional lifestyle. Welcome to this beautifully updated estate nestled on 10 private acres in one of St. Louis County's most prestigious estate

Mary Slay Dielmann Sotheby's International Realty

Recently Sold

$369,000

Sold Jun 29, 2026

Last List Price
- 2 Beds
- 2.5 Baths
- 1,800 Sq Ft
16176 Lea Oak Ct

Chesterfield, MO
- $205/SF
- 124 Days On Market
- Current Est. Value $368K
Mary Slay Dielmann Sotheby's International Realty

$525,000

Sold Dec 2, 2025

Last List Price
- 5 Beds
- 3 Baths
- 3,699 Sq Ft
3981 Cambridge Crossing Dr

Saint Charles, MO
- $142/SF
- 0 Days On Market
- Current Est. Value $544K
Mary Slay Dielmann Sotheby's International Realty

$570,000

Sold Sep 12, 2025

Last List Price
- 3 Beds
- 2.5 Baths
- 2,172 Sq Ft
7839 Stanford Ave

Saint Louis, MO
- $262/SF
- 4 Days On Market
- Current Est. Value $619K
Mary Slay Dielmann Sotheby's International Realty

$625,000

Sold Aug 6, 2025

Last List Price
- 4 Beds
- 3 Baths
- 4,166 Sq Ft
308 Amici Cir

Saint Louis, MO
- $150/SF
- 8 Days On Market
- Current Est. Value $615K
Mary Slay Dielmann Sotheby's International Realty

Price Undisclosed

Sold Jan 14, 2025
- 3 Beds
- 2.5 Baths
- 2,390 Sq Ft
6227 Loughborough Ave

Saint Louis, MO
- 56 Days On Market
- Current Est. Value $358K
Mary Slay Dielmann Sotheby's International Realty

Price Undisclosed

Sold Dec 31, 2024
- 6 Beds
- 6.5 Baths
- 7,585 Sq Ft
733 Deer Vue Ln

Fenton, MO
- 100 Days On Market
- Current Est. Value $2M
Mary Slay Dielmann Sotheby's International Realty

Price Undisclosed

Sold Mar 12, 2024
- 2 Beds
- 2 Baths
- 1,614 Sq Ft
176 N Brentwood Blvd

Unit B6

Saint Louis, MO
- 2 Days On Market
- Current Est. Value $630K
Mary Slay Dielmann Sotheby's International Realty

Price Undisclosed

Sold Feb 2, 2024
- 3 Beds
- 3.5 Baths
- 3,060 Sq Ft
117 Riggs Place

Saint Charles, MO
- 1 Day On Market
- Current Est. Value $581K
Mary Slay Dielmann Sotheby's International Realty

Price Undisclosed

Sold Aug 24, 2023
- 4 Beds
- 4.5 Baths
- 4,525 Sq Ft
12237 Ladue Rd

Saint Louis, MO
- 15 Days On Market
- Current Est. Value $1M
Mary Slay Dielmann Sotheby's International Realty

Awards and Designations

NAR - National Association of Realtors

Other Experience

First Time Home Buyers, Investments, Luxury Homes, New Construction

Agent License: Missouri STL

Mary Slay

(314) 461-1645

Responds Quickly

(314) 461-1645

Mary Slay

About Mary

Transaction History

Seller Deals

Buyer Deals

Seller Deals

Buyer Deals

Seller Deals

Buyer Deals

Production Over Time

5 Year View

Neighborhoods Mary is Experienced In

Mary's Listings and Deals

Mary's Active Listings

Recently Sold

Awards and Designations

Other Experience