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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART I, LINE 1:</FormAndLineReferenceDesc>
        <ExplanationTxt>UNCOMMON SCHOOLS NEW YORK CITY PREPARES OUR STUDENTS TO ENTER, SUCCEED IN, AND GRADUATE FROM COLLEGE. OUR ORGANIZATION COMPRISES 24 HIGH-PERFORMING PUBLIC SCHOOLS LOCATED IN BROOKLYN NEIGHBORHOODS, INCLUDING BROWNSVILLE, CROWN HEIGHTS, AND EAST NEW YORK. THIS YEAR, WE ARE PROVIDING A K-12 PATHWAY FOR 8,800+ STUDENTS AGED 5-18 ACROSS EIGHT ELEMENTARY, TWELVE MIDDLE, AND FOUR HIGH SCHOOLS. WE ARE ALSO PROVIDING REGULAR TOUCHPOINTS, ACCESS TO RESOURCES, AND CAREER GUIDANCE TO 800+ ALUMNI AGED 18-24 WHO ARE PURSUING COLLEGE DEGREES AND POST-SECONDARY SUCCESS. OUR STUDENTS AND FAMILIES ARE PRIMARILY PEOPLE OF COLOR FROM LOW-INCOME BACKGROUNDS WHO LIVE IN HISTORICALLY UNDERSERVED AREAS OF BROOKLYN. MORE THAN EIGHT IN TEN STUDENTS ARE ELIGIBLE FOR FREE- OR REDUCED-PRICE LUNCH, 88% ARE BLACK, 7% ARE LATINX, AND 4% ARE MULTI-RACIAL. UNCOMMON NYC IS MANAGED BY UNCOMMON SCHOOLS, INC. (USI) A CHARTER MANAGEMENT ORGANIZATION (CMO) THAT OPERATES 55 HIGH-PERFORMING PUBLIC SCHOOLS ACROSS NEW YORK, NEW JERSEY, AND MASSACHUSETTS. THOUGH WE ARE ADAPTING TO RESPOND TO THE PANDEMIC, UNCOMMON NYC REMAINS COMMITTED TO OUR CORE EDUCATIONAL MODEL, WITH EACH SCHOOL EXHIBITING: 1) A COLLEGE-PREPARATORY MISSION; 2) A LONGER SCHOOL DAY AND YEAR; 3) HIGH STANDARDS FOR ACADEMICS AND CHARACTER; 4) AN ACADEMICALLY-FOCUSED LEARNING ENVIRONMENT; 5) A FOCUS ON ACCOUNTABILITY AND DATA-DRIVEN INSTRUCTION; AND 6) A FACULTY OF COMMITTED AND TALENTED LEADERS AND TEACHERS. YEAR AFTER YEAR, WE HAVE CONSISTENTLY PROVEN THAT, BY RELENTLESSLY INNOVATING HOW OUR SCHOOLS IMPLEMENT THESE ATTRIBUTESNO MATTER WHAT CHALLENGES MIGHT ARISEOUR STUDENTS CAN CONTINUE TO DEFY THE ODDS AND LEAP OVER ACHIEVEMENT AND COLLEGE-READINESS BARS. AT THE END OF THE '19-20 SCHOOL YEAR, SENIORS ACROSS UNCOMMON NYC EXCEEDED THE COLLEGE READINESS BENCHMARKS IN READING/WRITING AND MATH, SCORING A COMBINED AVERAGE OF 1077, MORE THAN 60 POINTS ABOVE THE 1010 BENCHMARK SET BY THE COLLEGE BOARD, AND 5 POINTS HIGHER THAN THE CLASS OF 2019'S AVERAGE. FURTHERMORE, ALL JUNIOR CLASSES EXCEEDED THE COLLEGE READINESS BENCHMARKS FOR JUNIORS IN BOTH SUBJECTS, DESPITE HAVING FEWER OPPORTUNITIES TO TAKE THE EXAM DUE TO CANCELLATION OF EXAMS BY ADMINISTRATORS IN RESPONSE TO THE SPREAD OF THE NOVEL CORONAVIRUS. LAST YEAR, 100% OF UNCOMMON NYC SENIORS TOOK AT LEAST 1 AP EXAM BEFORE GRADUATING HIGH SCHOOL AND MORE THAN SIX IN TEN PASSED ONE OR MORE OF THE EXAMS THEY TOOK. WHILE NATIONAL AND STATE REPORTS FOR RECENT YEARS ARE NOT YET AVAILABLE FROM THE COLLEGE BOARD, OUR GRADUATES WELL EXCEEDED THE 2018 AP PASS RATE AVERAGES NATIONALLY (23% PASSING ONE OR MORE EXAM) AND AT THE STATE LEVEL (29%). THIS FALL, MORE THAN 8 IN 10 STUDENTS FROM NYC'S GRADUATING CLASS ENROLLED IN FOUR-YEAR COLLEGES, COMPARED TO A RECORD LOW NATIONWIDE OF FEWER THAN 3 IN 10. AS EDUCATORS OF STUDENTS FROM LOW-INCOME BACKGROUNDS STRUGGLE TO SUSTAIN STUDENT ATTENDANCE AND ENGAGEMENT, WE ARE HUMBLED TO REPORT THAT SINCE SY20-21 SCHOOL LAUNCH, WE HAVE MAINTAINED NEARLY 90% MEDIAN DAILY STUDENT ATTENDANCE ACROSS OUR SCHOOLS. RECENT SIGNIFICANT ACTIVITIES SINCE LAST MARCH, OUR TEAMS HAVE BEEN PIVOTING TO RE-IMAGINE OUR SCHOOLS' PROGRAMMING AND OPERATIONS FOR THE CURRENT CONTEXT. IN SPRING '20, WE WORKED URGENTLY TO ENSURE THAT NO MATTER STUDENTS' GRADE LEVEL THEY DID NOT MISS A DAY OF LEARNING AFTER WE CLOSED SCHOOLS. IN SUMMER '20, WE MARSHALLED CROSS-FUNCTIONAL TEAMS TO REFLECT ON AND ANALYZE OUR INITIAL PANDEMIC APPROACH AND BUILD EVEN BETTER TOOLS, SYSTEMS, TRAININGS, AND MODELS TO EDUCATE STUDENTS IN AND OUT OF THE PHYSICAL CLASSROOM DURING SY20-21. IN AUGUST, WE BEGAN TO PUT THIS PLANNING INTO PRACTICE, TRAINING ALL STAFF IN REMOTE BEST PRACTICES AND LAUNCHING OUR REMOTE 2.0 MODEL ACROSS ALL SCHOOLS. DIFFERENTIATED BY GRADE-SPAN AND LEVERAGING SEVERAL NEWLY ADOPTED AND ADAPTED EDUCATION TECHNOLOGY PLATFORMS AND TOOLS, OUR HIGH-QUALITY REMOTE 2.0 MODEL IS A CAREFUL, THOROUGH EVOLUTION OF THE MODEL WE IMPLEMENTED IN SPRING '20. IT MEETS ALL STUDENTS WHERE THEY ARE, KEEPS THEM ENGAGED IN THEIR SCHOOL COMMUNITY, AND ENSURESAND TRACKSTHAT THEY ARE LEARNING. TO GIVE EQUITABLE ACCESS TO THE PROGRAM, THIS FALL WE PROVIDED ALL 21,000+ STUDENTS UNCOMMON LAPTOPS WITH ALIGNED CAPABILITIES SO ALL OUR SCHOLARS COULD THRIVE REMOTELY. THIS JANUARY, WE BEGAN RE-OPENING OUR NYC SCHOOLS' DOORS FOR NEARLY 3,500 STUDENTS, LAUNCHING OUR HYBRID MODEL. UNDER THIS MODEL, STUDENTS ACROSS ELEMENTARY AND MIDDLE SCHOOLS LEARN IN SCHOOL AT LEAST TWICE A WEEK, HIGH SCHOOL STUDENTS (ONCE THEY RETURN) AT LEAST ONCE, AND OUR SPECIAL EDUCATION STUDENTS AND KINDERGARTENERS UP TO FOUR DAYS. OUR OPERATIONS TEAMS SPENT MONTHS DESIGNING STUDENTS' IN-SCHOOL EXPERIENCE FOR MAXIMUM SAFETY AND ACCESSIBILITY. SCHOOLS ARE NOT ONLY FULLY EQUIPPED WITH PPE AND SANITATION FOR ALL BUT ARE ALSO IMPLEMENTING PRE-ENTRY, IN-SCHOOL, AND DEPARTURE PROTOCOLS THAT GO ABOVE AND BEYOND STATE AND LOCAL GUIDELINES TO KEEP OUR STUDENTS, FAMILIES, AND STAFF AS SAFE AS WE KNOW HOW. DURING OUT-OF-SCHOOL DAYS, STUDENTS ENGAGE WITH THE REST OF THEIR CLASSMATES IN OUR REMOTE 2.0 PROGRAMMING, THE BACKBONE OF OUR SY20-21 APPROACH, WHICH CONTINUES TO PROVIDE LIVE INSTRUCTION, RESOURCES, ASSIGNMENTS, AND SMALL-GROUP INSTRUCTION FOR ALL 8,700+ NYC STUDENTS.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION A, LINE 3</FormAndLineReferenceDesc>
        <ExplanationTxt>THE SCHOOL UTILIZES UNCOMMON SCHOOLS, INC. ("USI"), AN UNRELATED 501(C)(3) ORGANIZATION, TO PROVIDE MANAGEMENT AND OTHER ADMINISTRATIVE SUPPORT SERVICES TO THE SCHOOL. THE SCHOOL DELEGATES HIRING OF CERTAIN EMPLOYEES, PLANNING AND EXECUTING BUDGETS, AND OTHER FINANCIAL OPERATIONS TO USI. DURING THE FISCAL YEAR ENDING JUNE 30, 2020, THE SCHOOL PAID USI $20,073,607 FOR THEIR SERVICES. BRETT PEISER IS ON THE SCHOOL'S BOARD OF TRUSTEES AND THE CEO OF USI. USI DOES NOT COMPENSATE BRETT PEISER TO BE ON THE BOARD OF THE SCHOOL AND HIS INVOLVEMENT WITH THE BOARD IS ON A VOLUNTEER BASIS. MICHAEL BLAKE IS AN EMPLOYEE OF USI AND IS THE MANAGING DIRECTOR OF THE NEW YORK STATE REGIONS. THE CHARTER SCHOOL PAYS USI MANAGEMENT FEES FOR THE SERVICES PROVIDED INCLUDING THE SERVICES OF MICHAEL BLAKE. MICHAEL BLAKE RECEIVED 2019 COMPENSATION FROM USI IN THE AMOUNT OF $163,069 AND NONTAXABLE BENEFITS OF $6,799.</ExplanationTxt>
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        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION A, LINE 7A</FormAndLineReferenceDesc>
        <ExplanationTxt>INCLUDED IN THE MEMORANDUM OF UNDERSTANDING BETWEEN THE SCHOOL AND THE MANAGEMENT COMPANY, THE MANAGEMENT COMPANY IS ALLOWED TO HAVE ONE REPRESENTATIVE ON THE BOARD OF TRUSTEES.</ExplanationTxt>
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        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 11B</FormAndLineReferenceDesc>
        <ExplanationTxt>THE FORM 990 IS PROVIDED TO THE BOARD, REVIEWED FOR ACCURACY AND FILED UPON APPROVAL.</ExplanationTxt>
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        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 12C</FormAndLineReferenceDesc>
        <ExplanationTxt>BOARD MEMBERS ARE REQUIRED TO EVALUATE AND DISCLOSE CONFLICTS OF INTERESTS ON AN ANNUAL BASIS.</ExplanationTxt>
      </SupplementalInformationDetail>
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        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 15</FormAndLineReferenceDesc>
        <ExplanationTxt>THROUGH THE ANNUAL BUDGET APPROVAL PROCESS ALL COMPENSATION FOR KEY EMPLOYEES IS APPROVED BY SCHOOL BOARD OF TRUSTEES.</ExplanationTxt>
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        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION C, LINE 19</FormAndLineReferenceDesc>
        <ExplanationTxt>GOVERNING DOCUMENTS AND CONFLICTS OF INTEREST POLICY ARE AVAILABLE UPON REQUEST.</ExplanationTxt>
      </SupplementalInformationDetail>
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        <FormAndLineReferenceDesc>FORM 990, PART XII, LINE 2C</FormAndLineReferenceDesc>
        <ExplanationTxt>THE PROCESS IS CONSISTENT WITH PRIOR YEARS.</ExplanationTxt>
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