Mary Lou Marquardt

Mary Lou Marquardt is a real estate agent with Howard Hanna Coach in Rockville Centre. MLS records credit Mary Lou with 1 transaction over the last 12 months, worth $615,000 in total sales volume. Across both sides of the deal, that is an average of $615,000 per transaction.

0.5 of those transactions were on the listing side, representing sellers, for $375,000. The other 0.5 were on the selling side, representing buyers, for $240,000. The split is close to even, so Mary Lou works for both sellers and buyers.

The average price differs by side: $750,000 for listings and $480,000 for buyer-side sales.

By sales volume, Mary Lou ranks 80th of the 85 agents in Rockville Centre with recorded sales, ahead of 6 percent of them. The typical agent there closed 3 transactions worth $2.3 million.

Statewide, Mary Lou is 12278th by volume among 14,678 New York agents with recorded sales.

In ZIP code 11570, the address on Mary Lou's MLS record, the median sold price was $961,500 across 10 sales between June 2026 and July 2026. Mary Lou's average transaction of $615,000 is below that median, so much of the work is in the more affordable part of the market.

Mary Lou is listed with Howard Hanna Coach, Rockville Centre. Other agents on the same office record, busiest first:

• Nancy O Brien10.5 transactions · 12M volume
• Deborah Gerbore13 transactions · 11.2M volume
• Dina Caffrey6 transactions · 4.6M volume
• Delia Frank4 transactions · 3.7M volume
• Sandra Asip5 transactions · 3.5M volume
• John Coughlin3 transactions · 2.8M volume

These other Rockville Centre agents also have recorded sales in the last 12 months. They are ranked by sales volume. Compare a few before you pick someone to interview.

• Mary Darcy32 transactions · 36.2M volume
• Chris Boylan30 transactions · 22M volume
• Nicholas Santillo28 transactions · 20.6M volume
• Kevin Leatherman31.5 transactions · 17.4M volume
• Ahmed Mohamed11 transactions · 15M volume
• Gloria Romanowski15.5 transactions · 14.4M volume

The numbers on this page come from public MLS and license records, last updated May 2026. Transaction counts and dollar volumes cover the last 12 months and are credited to the agent named on each record. Mary Lou has not claimed this profile, and a listing here does not mean Mary Lou or Howard Hanna Coach endorses or is affiliated with Expert Agents Near Me. We collect no reviews, so there are no ratings from us on this page.