Nonprofit · EIN 20-4401473
WARNECKE INSTITUTE INC
Tax-exempt · HEALDSBURG, CA 95448
Financials
| Year ended | Form | Revenue | Expenses | Net income | Total assets | Liabilities | Net assets |
|---|---|---|---|---|---|---|---|
| December 31, 2025 | 990 | $260,287 | $109,619 | $150,668 | $2,639,906 | $588 | $2,639,318 |
| December 31, 2024 | 990 | $82,418 | $53,512 | $28,906 | $2,487,297 | $332 | $2,486,965 |
| December 31, 2023 | 990 | $55,311 | $120,748 | -$65,437 | $2,458,832 | $773 | $2,458,059 |
Financial details: 990 for the year ended December 31, 2025
Revenue
- Contributions, gifts and grants
- $18,503
- Program service revenue
- $11,799
- Investment income
- $12,243
- Net rental income
- -$10,775
- Other revenue
- $217,742
Expenses
- Grants and similar amounts paid
- $0
- Other salaries and wages
- $11,537
- Salaries, compensation and benefits (total)
- $12,595
- Professional fundraising fees
- $0
- Accounting fees
- $5,805
- Occupancy
- $16,500
- Program services (functional)
- $30,945
- Management and general (functional)
- $78,674
Balance sheet and other
- Total assets, start of year
- $2,487,297
- Total assets, end of year
- $2,639,906
- Total liabilities, end of year
- $588
- Net assets, end of year
- $2,639,318
- Gross unrelated business income
- $17
- Gross receipts
- $260,287
- Employees
- 1
- Volunteers
- 4
- Year formed
- 2005
- State of legal domicile
- CA
From the e-filed returns the IRS publishes as XML (latest three processing years; amended returns replace the original). PDF copies at the IRS.
Officers, directors and key employees
As listed on the 990 for the year ended December 31, 2025, highest compensation first.
| Name | Title | Hours / week | Compensation |
|---|---|---|---|
| MARGO WARNECKE MERCK | PRESIDENT Trustee or director, Officer | 20 | $0 |
| FRED WARNECKE | DIRECTOR Trustee or director | 1 | $0 |
| AL MERCK | DIRECTOR Trustee or director | 1 | $0 |
| ALICE WARNECKE SUTRO | DIRECTOR/SECRETARY Trustee or director, Officer | 1 | $0 |
990 for the year ended December 31, 2024: 4 people
| Name | Title | Hours / week | Compensation |
|---|---|---|---|
| MARGO WARNECKE MERCK | PRESIDENT Trustee or director, Officer | 20 | $0 |
| FRED WARNECKE | DIRECTOR Trustee or director | 1 | $0 |
| AL MERCK | DIRECTOR Trustee or director | 1 | $0 |
| ALICE WARNECKE SUTRO | DIRECTOR/SECRETARY Trustee or director, Officer | 1 | $0 |
990 for the year ended December 31, 2023: 4 people
| Name | Title | Hours / week | Compensation |
|---|---|---|---|
| MARGO WARNECKE MERCK | PRESIDENT Trustee or director, Officer | 20 | $0 |
| FRED WARNECKE | DIRECTOR Trustee or director | 1 | $0 |
| AL MERCK | DIRECTOR Trustee or director | 1 | $0 |
| ALICE WARNECKE SUTRO | DIRECTOR/SECRETARY Trustee or director, Officer | 1 | $0 |
Address and contacts
- Address (IRS master file)
- 13427 CHALK HILL RD, HEALDSBURG, CA 95448-9043
- In care of
- % BERTHA BALDWIN
- Mailing address (990-N for 2015)
- C/O 190 CORTSEN ROAD, PLEASANT HILL CA 94523
- Principal officer (990 for 2025)
- MARGO WARNECKE MERCK, 13427 CHALK HILL ROAD, HEALDSBURG, CA 94548
- Principal officer (990-N for 2015)
- MARGO WARNECKE MERCK, C/O 190 CORTSEN ROAD, PLEASANT HILL CA 94523
- Signed the 990
- MARGO WARNECKE MERCK, PRESIDENT
- Phone
- (925) 945-6912
- Website
- WWW.CHALKHILLRESIDENCY.COM
- Return prepared by
- CBIZ ADVISORS LLC
California records
California keeps its own records of charities and corporations. Search them by EIN 20-4401473 or by the name WARNECKE INSTITUTE INC.
- Attorney General, Registry of Charities and Fundraisers
- Registration status and filed reports (CT-TR-1, RRF-1)
- Secretary of State, bizfile Online
- Corporation status, entity number, agent for service
- Franchise Tax Board
- Entity status letter (state tax exemption, good standing)
Mission
WARNECKE ARCHITECTURAL ARCHIVES MISSION:THE WARNECKE ARCHIVES WELCOMES AND ENCOURAGES THE STUDY OF ITS ARCHITECTURAL COLLECTION. A WEALTH OF MATERIAL EXISTS FOR HISTORIANS, STUDENTS, AND OTHER RESEARCHERS TO USE AT WARNECKE ARCHIVES. THE ARCHITECTURAL ARCHIVE LOCATED AT WARNECKE RANCH IN SONOMA COUNTY CA, CONTAINS SIGNIFICANT, PRIMARY SOURCE MATERIALS BY AND ABOUT NOTED CALIFORNIA ARCHITECTS, JOHN CARL WARNECKE AND HIS FATHER CARL I. WARNECKE. MORE THAN 100 YEARS AND OVER 800 PROJECTS WORTH OF ARCHITECTURAL PLANS, DRAWINGS, SKETCHES, PHOTOGRAPHS, PERSONAL PAPERS, JOURNALS, PROJECT FILES, AND CORRESPONDENCE MAKE UP ONE OF THE MOST EXTENSIVE, REMAINING ARCHITECTURAL ARCHIVES STILL IN ONE FAMILY, SINCE 1911. THEY ARE USED BY SCHOLARS, RESEARCHERS, PRIVATE INDIVIDUALS, AND ARTISTS. THE ARCHIVE IS OPEN TO THE PUBLIC BY APPOINTMENT. WE OFFER TOURS OF THE ARCHIVE.
Program accomplishments
- THE CHALK HILL ARTIST RESIDENCY PROGRAM PROVIDES ARTISTS OF ALL BACKGROUNDS, ABILITIES, AND MEDIUMS, WITH TIME AND SPACE FOR REFLECTIVE WORK IN A NATURAL ENVIRONMENT AND TO PRESERVE THE LANDSCAPE IN WHICH THE INSTITUTE IS FOUNDED.CHALK HILL RESIDENCY IS PROUD TO COLLABORATE WITH CREATIVE INSTITUTIONS AND COMMUNITY NONPROFITS TO FULFILL OUR MISSION OF PROVIDING TIME AND SPACE AT WARNECKE RANCH AND VINEYARD WHERE ARTISTS ARE VALUED, THRIVING, AND REPRESENT THE DIVERSE WORLD IN WHICH WE LIVE. OUR COMMUNITY PARTNERSHIPS WITH BECOMING INDEPENDENT (BI), CREATIVE GROWTH, CREATIVITY EXPLORED, AND NURTURING INDEPENDENCE THROUGH ARTISTIC DEVELOPMENT (NIAD) BRING ARTIST TEACHERS FROM THESE PROGRAMS TO SPEND A WEEK AT THE RESIDENCY TO WORK ON THEIR VARIOUS ARTISTIC ENDEAVORS. IN 2025 WE HOSTED 6 PARTNERSHIP TEACHING ARTISTS. CHALK HILL RESIDENCY PROGRAM - IN 2025, 10 ARTISTS OUT OF 56 APPLICANTS WERE SELECTED FOR RESIDENCY. THE SELECTION PROCESS INCLUDES THE COMMITTEE REVIEWING APPLICANT SUBMISSIONS FROM OUR ANNUAL CALL FOR ARTISTS AND SELECTION IS BASED ON QUALITY OF WORK, PROJECT PROPOSAL, AND RESUME. TOTAL ARTISTS SERVED:19 ARTISTS TOTAL INCLUDING 6 TEACHING ARTISTS (2 EACH FROM OUR PARTNERING NON-PROFITS: CREATIVE GROWTH, CREATIVITY EXPORED, AND NIAD).PUBLIC PROGRAMMING:OPEN STUDIOS: 3SPRING OPEN STUDIO MAY 3, 2025SUMMER OPEN STUDIO AUGUST 2, 2025 + FUNDRAISER SECOND ANNUAL ICE CREAM SOCIALFALL OPEN STUDIO: OCTOBER 12, 2025 MARTIN EVANS OPEN STUDIO: NOVEMBER 29, 202550-60 GUESTS ATTEND FROM OUR MAILING LIST FOR EACH EVENT.TOTAL NUMBER OF PEOPLE WHO ATTENDED OPEN STUDIOS AND/OR PARTICIPATED IN CHALK HILL ARTIST RESIDENCY PROGRAMS= 150 (APPROXIMATED)WORKSHOPS:WATERCOLOR WORKSHOP WITH QINQIN LIUGALLERY SHOW: "AT PLAY WITH COSMIC COINCIDENCE" BY FRIENDS OF THE RESIDENCY, CINDY LUBAR BISHOP AND SUSAN FIELD5 STUDIO VISITS:JUNE 3RD: EDGE ESMERELDA ARTIST VISIT AND ARCHIVE TOURSEPTEMBER 20TH: OPEN DOORS ARCHIVE TOURExpenses $27,849 · revenue $11,799
- WARNECKE ARCHITECTURAL ARCHIVES RESEARCH REQUEST: MILLER & WARNECKE RESIDENTIAL HOME PLANS REQUEST STEPHANIE WEHRLEY801 ROSEMOUNT ROAD, OAKLANDBUILT IN 1922 FOR R.W. KINNEY THREE AT&T LONG LINES BUILDING REQUESTSNICHOLAS MCCAULEYDAWSON ZHANG, UPENNAARON ERDOS, IE UNIVERSITY (SPAIN) COLLEGE OF SAN MATEOHISTORIC PHOTOGRAPHS, SLIDES AND DESIGNS FOR DOCOMOMO ARTICLEPUBLICATION DATE: MAY 2026AUTHOR: JOSH WEINBERG GOLDEN GATE VILLAGE IN MARIN CITY / PYATOK ARCHITECTSREVITALIZATION PLAN WITH BURBANK HOUSINGMILAN OUTLAW AND GARY STRUTHERS: PLANNING TO RENOVATE ALL THE BUILDINGSREQUEST FOR ORIGINAL PLANS, COLOR SLIDES, PHOTOS GOLDEN GATE VILLAGE IN MARIN CITY BOOK BY FELICIA GASTON LAFAYETTE SQUARE LANDSCAPE RESTORATION AND COURT BUILDINGSTRUST FOR THE NATIONAL MALLSTEVEN PRESTON, SENIOR PROJECT MANAGERREQUEST FOR ORIGINAL PLANS, COLOR SLIDES, PHOTOSUPDATE: WEBSITE PUBLISHED: HTTPS://NATIONALMALL.ORG/CONTENT/LAFAYETTE-PARK NOT DISPLACED, BUT ROOTED: HONORING THE ARCHITECTS WHO BUILT MARIN CITYARCHITECTURAL LEGACY PUBLICATIONBOOK IN PROCESS BY FELECIA GASTONMARIN CITY HISTORICAL & PRESERVATION SOCIETY ARTICLE: LAND, LEGACY AND LEADERSHIP: MARGO WARNECKE MERCK'S ENDURING SONOMA STORYBY GLENDA WINDERSSONOMA COUNTY FEATURES PUBLISHED AUGUST 2, 2025 MODERNIST RETAIL DESIGNERS IN AMERICAMARILYN FRIEDMAN - MFF DESIGN HISTORIANLECTURES ON ELEANOR LEMAIRE AND ILONKA KARASZ: MODERNIST RETAIL DESIGNERS IN AMERICATOUR, RESEARCH AND COLOR SLIDES AND PHOTOS REQUEST THE MODERN CREATIVE: A PRACTICAL GUIDE FOR 21ST CENTURY ARTISTSBOOK BY KAYE KELLY, PROFESSOR OF MUSIC AT BERKLEE COLLEGE OF MUSICINCLUDES A CHAPTER ON THE ARCHIVES MIRA VISTA SCHOOL, RICHMOND CAPOTENTIAL NOMINATION FOR NATIONAL REGISTER OF HISTORIC PLACESBY ALYSA CHADOW- BOOK: FASHION DESIGNER ANN LOWE AND MRS. JACKIE KENNEDYROSEANNE MONTILLOBOOK PROJECT ON THE LIFE OF FASHION DESIGNER ANN LOWE AND HER RELATIONSHIP WITHMRS. JACQUELINE KENNEDY.- MUSIC VIDEO PROJECT: ARCHITECTURAL MODELS AND IMAGESCAROLINE WAXSE, STANDING ON THE CORNER / XL RECORDINGSREMOTE IMAGE/DOCUMENT RETRIEVAL REQUEST. SEEKING ARCHIVAL IMAGES AND MODELVIEWS OF A WARNECKE DESIGNED BUILDING FOR USE IN A MUSIC VIDEO.BOOK: CAMELOT'S ARCHITECT - MOVING FORWARD WITH JOHN CARL WARNECKE MEMOIR: CAMELOT'S ARCHITECT. A HYBRID PUBLISHER HAS BEEN SELECTED: GREENLEAF, AND THE PUBLISHING DATE IS NOVEMBER 2026.Expenses $3,096
What it must file and when
IRS records say it files Form 990 or 990-EZ. Based on its last return; a smaller organization may file the 990-N. Its accounting year ends in December, so each return is due on the 15th day of the 5th month after that.
| Tax year | Year ended | Due | IRS public records |
|---|---|---|---|
| 2025 | December 31, 2025 | May 15, 2026 | 990 on file |
| 2024 | December 31, 2024 | May 15, 2025 | 990 on file |
| 2023 | December 31, 2023 | May 15, 2024 | 990 on file |
IRS record
- EIN
- 20-4401473
- Tax-exempt status
- 501(c)(3): Charitable, religious, educational or scientific organization
- Foundation status
- Publicly supported organization (170(b)(1)(A)(vi))
- Donations deductible (Pub 78)
- Public charity, 50% deduction limit
- Exempt since
- 2006
- Accounting year ends
- December
- Files
- Form 990 or 990-EZ
- Category (NTEE)
- Arts, culture and humanities (A40)
- Assets (IRS master file)
- $2,639,906
- Income (IRS master file)
- $260,287
Filing history
| Form | Year ended | Revenue | Expenses | Assets | Return |
|---|---|---|---|---|---|
| 990 | December 2025 | $260,287 | $109,619 | $2,639,906 | XML |
| 990-T | December 2025 | – | – | – | IRS |
| 990 | December 2024 | $82,418 | $53,512 | $2,487,297 | XML |
| 990-T | December 2024 | – | – | – | IRS |
| 990 | December 2023 | $55,311 | $120,748 | $2,458,832 | XML |
| 990-T | December 2023 | – | – | – | IRS |
| 990 | December 2022 | $47,234 | $62,597 | $2,524,386 | IRS |
| 990-T | December 2022 | – | – | – | IRS |
| 990 | December 2021 | – | – | – | IRS |
| 990-T | December 2021 | – | – | – | IRS |
| 990 | December 2020 | – | – | – | IRS |
| 990-T | December 2020 | – | – | – | IRS |
| 990 | December 2019 | – | – | – | IRS |
| 990-EZ | December 2018 | – | – | – | IRS |
| 990-N for 2015 Officer: MARGO WARNECKE MERCK | December 31, 2015 | ≤ $50,000 receipts | – | – | e-Postcard |
990-N: the IRS bulk file holds only the latest e-Postcard per organization; earlier years come from archived copies of that file since 2020 and can have gaps (the IRS e-Postcard search lists every one). 990, 990-EZ, 990-PF, 990-T: every e-filed return in the IRS e-file index since 2019; XML for the latest three processing years, amounts from the IRS Statistics of Income extracts before that. PDF copies and determination letters at the IRS (search EIN 20-4401473).
Questions about WARNECKE INSTITUTE INC
- What is the EIN of WARNECKE INSTITUTE INC?
- The employer identification number (EIN) of WARNECKE INSTITUTE INC is 20-4401473.
- Is WARNECKE INSTITUTE INC tax-exempt?
- Yes. The IRS lists it as tax-exempt under section 501(c)(3) since 2006.
- Are donations to WARNECKE INSTITUTE INC tax-deductible?
- Yes. It is listed in IRS Publication 78 (Public charity, 50% deduction limit).
- Which annual return does WARNECKE INSTITUTE INC file?
- Form 990 or 990-EZ. Based on its last return; a smaller organization may file the 990-N.
- When is the next return of WARNECKE INSTITUTE INC due?
- The return for tax year 2026 (the year ending December 31, 2026) is due May 17, 2027. Form 8868 extends it by six months; the 990-N cannot be extended.
- When did WARNECKE INSTITUTE INC last file with the IRS?
- The latest return in the IRS public files is the 990 for the year ended December 2025.
- Who is the principal officer of WARNECKE INSTITUTE INC?
- The 990 for the year ended December 31, 2025 names MARGO WARNECKE MERCK.
- Who are the officers and directors of WARNECKE INSTITUTE INC?
- The 990 for the year ended December 31, 2025 lists 4 people; 0 received compensation from the organization.
- How much revenue does WARNECKE INSTITUTE INC have?
- On its 990 for the year ended December 31, 2025 it reported revenue of $260,287, expenses of $109,619 and total assets of $2,639,906 at year end.
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All nonprofits in HEALDSBURG · California · Arts, culture and humanities