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        <FormAndLineReferenceDesc>Part IV, Line 2b:</FormAndLineReferenceDesc>
        <ExplanationTxt>The History Center acts as the fiscal agent for the Electric Building Tenants Committee (EBTC). As the fiscal agent, the History Center holds the unspent funds and reports the cash balances in restricted cash and a corresponding liability in the statement of financial position. Custodial funds held for the EBTC totaled $73,297 and $9,911 as of June 30, 2025 and 2024, respectively. The History Center also holds funds related to the former Sailing Exhibit until they can be transferred to the San Diego Maritime Museum along with the exhibit to be placed in a new facility. Funds held for others, reported as restricted cash and a corresponding liability in the statement of financial position, totaled $109,522 and $107,399 as of June 30, 2025 and 2024, respectively.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART III, LINE 4a</FormAndLineReferenceDesc>
        <ExplanationTxt>DURING THE REPORTING PERIOD THE SAN DIEGO HISTORY CENTER PRESENTED EXHIBITIONS THAT SEEK TO ENGAGE, EDUCATE AND MAKE OUR REGION'S HISTORY RELEVANT TO TODAY: ALOHA VAQUEROS EXPLORED THE UNIQUE CULTURAL BLENDING OF NATIVE HAWAIIAN AND MEXICAN VAQUERO (COWBOY) TRADITIONS IN THE AMERICAN WEST. THE EXHIBIT HIGHLIGHTS THE OFTEN-OVERLOOKED STORIES OF PANIOLO (HAWAIIAN COWBOYS) AND THEIR CONTRIBUTIONS TO RANCHING, HORSEMANSHIP, AND CROSS-CULTURAL IDENTITY IN MEXICO, SAN DIEGO AND HAWAII. TASTE SAN DIEGO: FILIPINO CULINARY JOURNEYS CELEBRATES THE RICH CULINARY HERITAGE OF SAN DIEGO'S FILIPINO COMMUNITY THROUGH FAMILY RECIPES, PERSONAL STORIES, AND HISTORICAL CONTEXT. TASTE SAN DIEGO INVITES VISITORS TO EXPLORE HOW FOOD SERVES AS A VITAL THREAD IN PRESERVING CULTURAL IDENTITY AND FOSTERING COMMUNITY ACROSS GENERATIONS. LA NEIGHBOR: COLLOQUIALLY KNOWN AS LA NEIGHBOR, THE NEIGHBORHOOD HOUSE WAS THE NEXUS OF RELATIONS IN LOGAN HEIGHTS AND OFFERED INTEGRAL SERVICES LIKE HEALTH CARE, FOOD DISTRIBUTION, ENGLISH-LANGUAGE CLASSES, A COMMUNITY OVEN, CITIZENSHIP CLASSES, AND ENRICHMENT ACTIVITIES. THIS NEW EXHIBITION BRINGS TOGETHER THE WRITTEN HISTORY OF THE HOUSE, ALONG WITH NEARLY TWENTY NEW ORAL HISTORY INTERVIEWS FROM FORMER LOGAN HEIGHTS RESIDENTS AND NEIGHBORHOOD HOUSE PARTICIPANTS WHO WERE IMPACTED BY ITS SERVICES. ART PRIZE SAN DIEGO IS AN ANNUAL AWARD HONORING ARTISTIC EXPRESSION WITH A CASH PRIZE, EXHIBITION OPPORTUNITIES, AND SPOTLIGHTS ARTISTS IN THE SAN DIEGO TO ENSENADA, MEXICO REGION WHOSE OUTSTANDING ACHIEVEMENTS IN THE FIELD OF VISUAL ARTS MERIT RECOGNITION. THE EXHIBIT OFFERS A PLATFORM FOR EMERGING AND ESTABLISHED ARTISTS TO ENGAGE WITH HISTORICAL THEMES AND CURRENT ISSUES, BRIDGING ART AND PUBLIC HISTORY. SAN DIEGO STEM WOMEN HONORS THE CONTRIBUTIONS OF WOMEN IN SAN DIEGO'S STEM (SCIENCE, TECHNOLOGY, ENGINEERING, AND MATHEMATICS) FIELDS, BOTH PAST AND PRESENT. FEATURING PROFILES, ARTIFACTS, AND INTERACTIVE ELEMENTS, STEM WOMEN SAN DIEGO HIGHLIGHTS THE GROUNDBREAKING WORK AND CHALLENGES FACED BY LOCAL TRAILBLAZERS. FASHION REDUX: GRAND OCCASIONS IS AN ANNUAL COLLABORATION WITH MESA COLLEGE'S FASHION PROGRAM, AND SPOTLIGHTS HISTORICAL GARMENTS FROM THE SDHC COLLECTION ALONGSIDE STUDENT-DESIGNED CONTEMPORARY INTERPRETATIONS. THE 2025 THEME EXPLORES FASHION WORN DURING SIGNIFICANT MILESTONES SUCH AS WEDDINGS, GALAS, AND FORMAL CEREMONIES. LGBTQ+ SAN DIEGO: STORIES OF STRUGGLES + TRIUMPHS FEATURES STORIES AND PERSONAL HISTORIES THAT CELEBRATE SAN DIEGO'S LGBTQ+ COMMUNITIES. DESIGNED AS A REPRISE OF THE HISTORY CENTER'S GROUND-BREAKING EXHIBITION OF 2018 IN COLLABORATION WITH LAMBDA ARCHIVES OF SAN DIEGO. DESIGNED FOR FLEXIBILITY AND COMMUNITY ENGAGEMENT, THIS EXHIBIT APPEARS AT SDHC AND VARIOUS PUBLIC SPACES TO INCREASE ACCESS AND VISIBILITY OF LGBTQ+ HISTORY THROUGHOUT THE REGION.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART III, LINE 4b</FormAndLineReferenceDesc>
        <ExplanationTxt>THE SAN DIEGO HISTORY CENTER'S LIFE-LONG LEARNING PROGRAM, CONSISTING OF BOTH K-12 AND PUBLIC PROGRAMS, EXPANDED SUMMER SCHOOL PROGRAMS IN CONJUNCTION WITH THE SAN DIEGO UNIFIED SCHOOL DISTRICT'S LEVEL UP PROGRAM THAT ARE IN ADDITION TO THE HISTORY CENTER'S ONGOING PARTNERSHIP WITH PRICE PHILANTHROPIES SCHOOL IN THE PARK AND ON-SITE FIELD TRIPS THAT ARE FUNDED BY THE PATRONS OF THE PRADO BUCKS 4 BUSSES PROGRAM. STUDENT PROGRAMMING INCLUDES SEE YOURSELF HERE AN IMMERSIVE PROGRAM FOR STUDENTS HIGHLIGHTING HISTORY MAKERS AND COMMUNITY HEROES.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART III, LINE 4c</FormAndLineReferenceDesc>
        <ExplanationTxt>A SIGNIFICANT ADDITION TO THE SAN DIEGO HISTORY CENTER'S COLLECTIONS HAS BEEN THE ACQUISITION OF THE ARCHIVE OF THE BORREGO SUN NEWSPAPER, THAT WAS FOR MANY YEARS OWNED AND OPERATED BY THE SANDIEGO BASED COPLEY PRESS. A GENEROUS DONOR, WHO WISHES TO REMAIN ANONYMOUS, ALONG WITH THE NEWSPAPERS OWNER, PROVIDED THE FUNDING NECESSARY FOR THEARCHIVE THAT DOCUMENTS MORE THAN 70 YEARS OF THE HISTORY OF BORREGO SPRINGS, SAN DIEGO'S MID-CENTURY MODERN DESERT RESORT COMMUNITY. ALSO, OF SIGNIFICANCE IS THE COMMUNITY ORAL HISTORIES AND ACQUISITIONS OF THE ALL-IN COMMUNITY ARCHIVING PROGRAM. AS PART OF ITS CORE COLLECTIONS MISSION, THE SAN DIEGO HISTORY CENTER CONTINUES TO ADVANCE "DIGITAL FIRST" BY MAKING ITS COLLECTIONS AVAILABLE TO THE PUBLIC. THE COMPLETE CATALOGUE OF THE SAN DIEGO HISTORY CENTER'S DOCUMENT, PHOTO, FINE ART, ORAL HISTORY AND 3D OBJECTS COLLECTION IS AVAILABLE ON LINE (HTTPS://SANDIEGOHISTORY.PASTPERFECTONLINE.COM/). IN ADDITION, THE HISTORY CENTER CONTINUES TO EXPAND ITS DIGITAL HOLDINGS - MAKING MORE IMAGES, PHOTOS AND ART ACCESSIBLE THROUGH ITS ON-LINE COLLECTION PORTAL (HTTPS://COLLECTIONS.SANDIEGOHISTORY.ORG/). ACCESS TO THE ARCHIVE IS THROUGH APPOINTMENTS (FEE BASED DEPENDENT UPON RESEARCH USE) OR THROUGH LOW OR NO-COST "COMMUNITY RESEARCH ACCESS DAYS". A LONG-TERM INSTITUTIONAL GOAL IS TO REDUCE AND/OR REMOVE ENTIRELY ACCESS AND LICENSING FEES FOR PERSONAL RESEARCH AND TO HIRE ADDITIONAL STAFFING NEEDED TO OPEN THE ARCHIVE FOR ADDITIONAL RESEARCH HOURS. COLLECTION STAFF HAVE ALSO WORKED ON THE BACKLOG OF MORE THAN 500 PREVIOUSLY UNPROCESSED COLLECTIONS AND THE EVALUATION OF EXISTING HOLDINGS AGAINST THE HISTORY CENTER'S MISSION. THE RESPONSIBILITIES OF COLLECTION SPECIALISTS ARE NOT JUST TO ASSIST THE PUBLIC WITH RESEARCH INQUIRIES AS THEY RESPONSIBILITIES INCLUDE COLLECTIONS PROCESSING, CREATING FINDING AIDS, COLLECTIONS PRESERVATION, DIGITIZATION AND EVALUATION OF COLLECTIONS ITEMS IN LIGHT OF THE INSTITUTIONS' MISSION.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section B, line 11b</FormAndLineReferenceDesc>
        <ExplanationTxt>FORM 990 IS PROVIDED IN DRAFT FORM TO THE EXECUTIVE COMMITTEE FOR REVIEW AND THEN PROVIDED TO ALL TRUSTEES FOR APPROVAL.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section B, line 12c</FormAndLineReferenceDesc>
        <ExplanationTxt>ALL TRUSTEES AND EMPLOYEES ANNUALLY DISCLOSE ANY POTENTIAL CONFLICTS OF INTERESTS.</ExplanationTxt>
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        <FormAndLineReferenceDesc>Form 990, Part VI, Section B, line 15</FormAndLineReferenceDesc>
        <ExplanationTxt>COMPENSATION FOR KEY EMPLOYEES OTHER THAN THE EXECUTIVE DIRECTOR IS DETERMINED BY THE EXECUTIVE DIRECTOR THROUGH COMPARATIVE SALARY SURVEYS FOR THE MUSEUM/NONPROFIT INDUSTRY NATIONWIDE, COMPETITIVE SALARY SURVEYS WITHIN THE CULTURAL INSTITUTIONS OF BALBOA PARK AND COMPETITIVE SURVEYS BY THE SAN DIEGO EMPLOYERS ASSOCIATION. THE SALARIES ARE REVIEWED AND CONFIRMED BY THE EXECUTIVE COMMITTEE OF THE BOARD OF TRUSTEES AND THE BOARD THROUGH THE BUDGET PROCESS.</ExplanationTxt>
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        <FormAndLineReferenceDesc>Form 990, Part VI, Section C, line 19</FormAndLineReferenceDesc>
        <ExplanationTxt>ALL GOVERNING DOCUMENTS ARE AVAILABLE FOR PUBLIC INSPECTION DURING REGULAR BUSINESS HOURS AT THE ORGANIZATIONS OFFICES.</ExplanationTxt>
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        <FormAndLineReferenceDesc>Form 990, Part VI, Line 15A</FormAndLineReferenceDesc>
        <ExplanationTxt>THE EXECUTIVE GOVERNANCE COMMITTEES REVIEW EXECUTIVE COMPENSATION UTILIZING COMPARABLE DATA. SALARIES ARE APPROVED BY THE FULL BOARD AS PART OF THE BUDGET PROCESS.</ExplanationTxt>
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