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Exhibit 21.1

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Subsidiaries of Franklin Street Properties Corp.

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Name

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Jurisdiction of Organization

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FSP 1001 17th Street LLC

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Delaware

FSP 121 South Eighth Street LLC

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Delaware

FSP 1999 Broadway LLC

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Delaware

FSP 303 EWD LLC

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Delaware

FSP 600 17th Street LLC

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Delaware

FSP 801 Marquette Avenue LLC

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Delaware

FSP Addison Circle Corp.

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Delaware

FSP Addison Circle Limited Partnership

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Texas

FSP Addison Circle LLC

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Delaware

FSP Collins Crossing Corp.

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Delaware

FSP Collins Crossing Limited Partnership

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Texas

FSP Collins Crossing LLC

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Delaware

FSP Eldridge Green Corp.

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Delaware

FSP Eldridge Green Limited Partnership

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Texas

FSP Eldridge Green LLC

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Delaware

FSP GB LLC

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Delaware

FSP Greenwood Plaza Corp.

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Delaware

FSP Holdings LLC

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Delaware

FSP Innsbrook Corp.

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Delaware

FSP Investments LLC

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Massachusetts

FSP Legacy Tennyson Center LLC

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Delaware

FSP Liberty Plaza Limited Partnership

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Texas

FSP One Legacy Circle LLC

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Delaware

FSP Park Ten Development Corp.

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Delaware

FSP Park Ten Development LLC

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Delaware

FSP Park Ten Limited Partnership

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Texas

FSP Park Ten LLC

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Delaware

FSP Park Ten Phase II Limited Partnership

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Texas

FSP Pershing Park Plaza LLC

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Delaware

FSP Plaza Seven LLC

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Delaware

FSP Property Management LLC

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Massachusetts

FSP Protective TRS Corp.

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Massachusetts

FSP REIT Protective Trust

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Massachusetts

FSP Westchase LLC

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Delaware

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