Item 2(c)(1) Originator Name Originator Name for co-originated loans was truncated to only include the originator contributing to the BBCMS 2021-C12 transaction to meet EDGAR constraints. Item 2(c)(4) Original Term Loan Number For anticipated repayment date mortgage loans: the original term loan number represents the term of the mortgage loan through the anticipated repayment date, rather than the actual Maturity Date. Item 2(c)(15) Loan Structure Code For the mortgage loan identified as HQ @ First (Asset Number 6), the mortgage loan is evidenced by a senior pari passu notes that is part of a loan combination that consists of senior pari-passu notes and one or more subordinate notes. The other senior pari-passu notes and the subordinate notes are not included in the trust. Item 2(d)(1) Property Name For mortgage loans that are part of a loan combination, the related mortgaged property secures the entire loan combination, including one or more companion loans not included in the trust. Item 2(d)(8) Net Rentable Square Feet Number For property types where the standard unit of measure is not square feet, this field is left blank. For mortgage loans that are part of a loan combination, net rentable square feet is presented for the entire mortgaged property that secures the whole loan combination, including one or more companion loans not included in the trust. Item 2(d)(9) Net Rentable Square Feet Securitization Number For property types where the standard unit of measure is not square feet, this field is left blank. For mortgage loans that are part of a loan combination, the net rentable square feet securitization number is presented for the entire mortgaged property that secures the whole loan combination, including one or more companion loans not included in the trust. Item 2(d)(10) Units Beds Rooms Number For mortgage loans that are part of a loan combination, the units beds rooms number relates to the entire mortgaged property that secures the whole loan combination, including one or more companion loans not included in the trust. Item 2(d)(11) Units Beds Rooms Securitization Number For mortgage loans that are part of a loan combination, the units beds rooms securitization number relates to the entire mortgaged property that secures the whole loan combination, including one or more companion loans not included in the trust. Item 2(d)(14) Valuation Securitization Amount For mortgage loans that are part of a loan combination, the valuation securitization amount relates to the entire mortgaged property that secures the whole loan combination, including one or more companion loans not included in the trust. Item 2(d)(20) Physical Occupancy Securitization Percentage The percentage of rentable space is determined based on the applicable unit of measurement provided in 2(d)(9) or 2(d)(11). Item 2(d)(25)(iii) Lease Expiration Largest Tenant Date For mortgage loans identified as Henderson Properties (Asset Number 18), South Dade Canal (Asset Number 48), Sebastian Canal (Asset Number 52) and Big Al's Canal (Asset Number 53), the Lease Expiration Largest Tenant Date is MTM and has been left blank due to EDGAR constraints. Item 2(d)(26)(iii) Lease Expiration Second Largest Tenant Date For mortgage loans identified as South Dade Canal (Asset Number 48), Sebastian Canal (Asset Number 52) and Big Al's Canal (Asset Number 53), the Lease Expiration Second Largest Tenant Date is MTM and has been left blank due to EDGAR constraints. Item 2(d)(27)(iii) Lease Expiration Third Largest Tenant Date For mortgage loans identified as Henderson Properties (Asset Number 18), South Dade Canal (Asset Number 48), Sebastian Canal (Asset Number 52) and Big Al's Canal (Asset Number 53), the Lease Expiration Third Largest Tenant Date is MTM and has been left blank due to EDGAR constraints. Item 2(d)(28)(i) Financials Securitization Date For the mortgage loans identified as Mills Fleet Farm Brooklyn Ranch (Asset Number 11), 445 Vanderbilt (Asset Number 15), Glendale Industrial (Asset Number 17), NAI Net Lease Portfolio (Asset Number 23), 356-362 E 148th Street (Asset Number 26), Fresenius - Brooklyn (Asset Number 28), ExchangeRight In-Line Retail Portfolio 1 (Asset Number 33), AMG Industrial Portfolio (Asset Number 38), CVS Florida Portfolio (Asset Number 51), 459 Culley Drive (Asset Number 56), Cameron Ashley Industrial Portfolio (Asset Number 61) and Tractor Supply - Warrenton (Asset Number 65), the Financials Securitization Date has been left blank as it was not available at the time of securitization. For the mortage loan identified as 818 Sterling Place and Bronx Portfolio (Asset Number 42), Financials Securitization date at the loan level is left blank since there are multiple Financials Securitization start dates at the property levels. Item 2(d)(28)(iv) Revenue Securitization Amount For mortgage loans that are part of a loan combination, the revenue securitization amount is presented for the entire mortgaged property that secures the whole loan combination, including one or more companion loans not included in the trust. Item 2(d)(28)(vi) Operating Expenses Securitization Amount For mortgage loans that are part of a loan combination, the total underwritten operating expenses securitization amount are presented for the entire mortgaged property that secures the whole loan combination, including one or more companion loans not included in the trust. Item 2(d)(28)(viii) Net Operating Income Securitization Amount For mortgage loans that are part of a loan combination, the net operating income securitization amount is presented for the entire mortgaged property that secures the whole loan combination, including one or more companion loans not included in the trust. Item 2(d)(28)(x) Net Cash Flow Securitization Amount For mortgage loans that are part of a loan combination, the net cash flow securitization amount is presented for the entire mortgaged property that secures the whole loan combination, including one or more companion loans not included in the trust. Item 2(d)(28)(xv) Debt Service Coverage Net Operating Income Securitization Percentage For mortgage loans that are part of a loan combination, the debt service coverage net operating income securitization percentage is calculated based on the subject mortgage loan and any related pari passu companion loans not included in the trust, but without regard to any subordinate companion loans. For mortgage loan identified as AMF Portfolio (Asset Number 1), whole loan UW NOI DSCR and the total debt UW NOI DSCR are equal due to the mezzanine loan fully amortizing the payment prior to the amortization commencement date of the mortgage loan. Item 2(d)(28)(xvii) Debt Service Coverage Net Cash Flow Securitization Percentage For mortgage loans that are part of a loan combination, the debt service coverage net cash flow securitization percentage is calculated based on the subject mortgage loan and any related pari passu companion loans not included in the trust, but without regard to any subordinate companion loans. For mortgage loan identified as AMF Portfolio (Asset Number 1), whole loan UW NCF DSCR and the total debt UW NCF DSCR are equal due to the mezzanine loan fully amortizing the payment prior to the amortization commencement date of the mortgage loan. Item 2(e)(6) Servicer Trustee Fee Rate Percentage It should be noted that the rate presented consists of (i) the master servicing fee rate, which includes any primary servicing fee rate payable to an outside servicer (for a loan combination) or other primary servicer, and any subservicing fee rate, (ii) the certificate administrator / trustee fee rate payable to the certificate administrator and the trustee, (iii) the operating advisor fee rate, (iv) the asset representations reviewer fee and (v) the CREFC(R) intellectual property royalty license fee rate. Item 2(f)(1) Primary Servicer Name KeyBank National Association was truncated to KeyBank N.A. to meet EDGAR constraints. Wells Fargo Bank, National Association was truncated to Wells Fargo Bank, N.A. to meet EDGAR constraints.