Investor profile - MA
William Senne
William Senne is a real estate investor and operator based in Boston-Worcester, MA-NH. Public filings show activity across 97 properties held through 42 holding companies. Recent mortgage relationships include First Boston Capital Partners, Cardinal Capital Group, and RD ADVISORS.
William's Activity
As of December 2025, public records show approximately $229.3M in recorded mortgage exposure linked to this investor across at least 116 mortgage filings and 97 properties held through 42 holding companies. Activity appears concentrated in residential and commercial assets recorded between 2011 and 2025.
Primary Geography
Boston-Worcester, MA-NH
ZIP codes: 02138, 02139, 02140, 02180, and 02540
Most recorded activity for this investor appears in CAMBRIDGE, STONEHAM, FALMOUTH, BOSTON, and BILLERICA.
Property Type Breakdown
Associated Entities (42)
MA · 2 properties · 15 mortgages
MA · 2 properties · 12 mortgages
MA · 0 properties · 10 mortgages
+39 more not shown
Mortgages (116)
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 | - |
+113 more not shown
Owned Properties (97)
| Address | Deeded owner | Status | Consideration |
|---|---|---|---|
| 16 PORTER ST, BILLERICA, MA 01821 | PORTER STREET RESIDENCES LLC | Sold | $0 |
| 97 ELMWOOD ST, CAMBRIDGE, MA 02140 203 | KEVIN LYNCH | Sold | $1.3M |
| 781 MAIN ST, CAMBRIDGE, MA 02139 | - | Sold | $0 |
+94 more not shown
FAQ
What type of real estate does this investor focus on?
Associated mortgages and deeds show activity in residential, commercial, and multifamily properties across Boston-Worcester, MA-NH.
What companies is William Senne associated with?
William Senne is associated with 42 entities based on extracted signatures from public records. Key entities include 286 GRAND AVENUE LLC, 805 MAIN STREET LLC, 95 99 ELMWOOD STREET LLC, SENNE INVESTMENTS LLC, and 25 TREMONT STREET LLC.
How many properties are associated with this investor?
At least 97 properties are associated with William Senne and the entities they control, based on signatures extracted from recorded documents connecting William Senne to the entities.
Which lenders has this investor worked with?
Recent mortgage activity references First Boston Capital Partners, Cardinal Capital Group, and RD ADVISORS, indicating a mix of lending relationships.
How recent is their activity?
Records show activity from 2011 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.
Elementix is not a consumer reporting agency, and this information does not constitute a consumer report. The data may not be used to make decisions about an individual's eligibility for personal credit, consumer housing, employment, insurance, or any other purpose governed by the Fair Credit Reporting Act.
Elementix may suppress certain contact indicators where legally required or where appropriate for safety or privacy reasons. Requests for removal, suppression, or correction of information must be submitted to compliance@elementix.ai. Elementix reviews such requests only where required by applicable law or where information is factually inaccurate. General objections or unsupported demands do not create a removal obligation.