Investor Profile - MD
Mark Koski
Mark Koski is a real estate investor and operator based in Washington-Baltimore, DC-MD-VA. Public filings show activity across 2 properties held through 2 holding companies. Recent mortgage relationships include ACNB Bank and NEW WINDSOR STATE BANK.
Mark's Activity
As of June 2026, public records show approximately $4.0M in recorded mortgage exposure linked to this investor across at least 3 mortgage filings and 2 properties held through 2 holding companies. Activity appears concentrated in commercial and residential assets recorded between 2016 and 2025.
Associated People
Primary Geography
Washington-Baltimore, DC-MD-VA
ZIP codes: 21048 and 21153
Most activity in FINKSBURG and STEVENSON.
Property Type Breakdown
Associated Entities (2)
MD · 1 property · 3 mortgages
MD · 0 properties · 0 mortgages
Mortgages (3)
Top Lenders
$2.4M · 1 loan
$1.6M · 2 loans
| Date | Amount | Status | Lender | Borrower | Address |
|---|---|---|---|---|---|
| 10/28/2021 | $2.4M | Open | ACNB Bank | GBMK ENTERPRISES LLC | 2926 BALTIMORE BLVD, FINKSBURG, MD 21048 |
| 07/15/2016 | $43k | Open | NEW WINDSOR STATE BANK | GBMK ENTERPRISES LLC | 2926 BALTIMORE BLVD, FINKSBURG, MD 21048 |
+1 more not shown
Owned Properties (2)
| Address | Deeded owner | Status | Consideration |
|---|---|---|---|
| 1301 HILLSIDE RD, STEVENSON, MD 21153 | MARK KOSKI | Sold | $250k |
| 2926 BALTIMORE BLVD, FINKSBURG, MD 21048 | GBMK ENTERPRISES LLC | Owns - 56.4 yrs | $0 |
FAQ
What type of real estate does this investor focus on?
Associated mortgages and deeds show activity in commercial and residential properties across Washington-Baltimore, DC-MD-VA.
What companies is Mark Koski associated with?
Mark Koski is associated with 2 entities based on extracted signatures from public records. Key entities include GBMK ENTERPRISES LLC and MARK & DEBORAH KOSKI REVOCABLE LIVING TRUST.
How many properties are associated with this investor?
At least 2 properties are associated with Mark Koski and the entities they control, based on signatures extracted from recorded documents connecting Mark Koski to the entities.
Which lenders has this investor worked with?
Recent mortgage activity references ACNB Bank and NEW WINDSOR STATE BANK, indicating a mix of lending relationships.
How recent is their activity?
Records show activity from 2016 through 2025, with the most recent mortgage recorded in 2021.
How is associated activity determined?
Elementix uses AI to extract signatures from recorded documents. These signatures are used to determine the relationships between people and entities. This is a novel approach that goes beyond looking at corporate filings and skip-tracing.
The information displayed on this page is compiled from recorded real estate documents, business filings, and other lawfully available sources. Elementix summarizes and analyzes public record activity related to investment real estate and associated business entities. Any contact indicators shown (such as email domain references or partial phone digits) are provided solely as unverified signals and may be incomplete or outdated.
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