Investor profile - MA
William Senn
William Senn is a real estate investor and operator based in Boston-Worcester, MA-NH. Public filings show activity across 53 properties held through 8 holding companies. Recent mortgage relationships include First Boston Capital Partners, Cardinal Capital Group, and Hingham Savings.
William's Activity
As of December 2025, public records show approximately $101.6M in recorded mortgage exposure linked to this investor across at least 57 mortgage filings and 53 properties held through 8 holding companies. Activity appears concentrated in residential and multifamily assets recorded between 2017 and 2025.
Primary Geography
Boston-Worcester, MA-NH
ZIP codes: 02138, 02140, 02180, 02540, and 02139
Most recorded activity for this investor appears in CAMBRIDGE, STONEHAM, FALMOUTH, SOMERVILLE, and ACTON.
Property Type Breakdown
Associated Entities (8)
MA · 2 properties · 15 mortgages
MA · 2 properties · 12 mortgages
MA · 0 properties · 10 mortgages
+5 more not shown
Mortgages (57)
Top Lenders
| Date | Amount | Status | Lender | Borrower | Address |
|---|---|---|---|---|---|
| 08/19/2025 | $559k | Open | Stonington Capital | ONE LEWIS WHARF LLC | - |
| 07/24/2025 | $525k | Open | Stonington Capital | ONE LEWIS WHARF LLC | - |
| 03/14/2025 | $3.5M | Open | First Boston Capital Partners | 95 99 ELMWOOD STREET LLC | - |
+54 more not shown
Owned Properties (53)
| Address | Deeded owner | Status | Consideration |
|---|---|---|---|
| 97 ELMWOOD ST, CAMBRIDGE, MA 02140 203 | KEVIN LYNCH | Sold | $1.3M |
| 781 MAIN ST, CAMBRIDGE, MA 02139 | - | Sold | $0 |
| 97 ELMWOOD ST, CAMBRIDGE, MA 02140 203 | 95 99 ELMWOOD STREET LLC | Sold | $0 |
+50 more not shown
FAQ
What type of real estate does this investor focus on?
Associated mortgages and deeds show activity in residential, multifamily, and commercial properties across Boston-Worcester, MA-NH.
What companies is William Senn associated with?
William Senn is associated with 8 entities based on extracted signatures from public records. Key entities include 286 GRAND AVENUE LLC, 805 MAIN STREET LLC, 95 99 ELMWOOD STREET LLC, 25 TREMONT STREET LLC, and 29 WINSLOW STREET LLC.
How many properties are associated with this investor?
At least 53 properties are associated with William Senn and the entities they control, based on signatures extracted from recorded documents connecting William Senn to the entities.
Which lenders has this investor worked with?
Recent mortgage activity references First Boston Capital Partners, Cardinal Capital Group, and Hingham Savings, indicating a mix of lending relationships.
How recent is their activity?
Records show activity from 2017 through 2025, with the most recent mortgage recorded in 2025.
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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