Item Number Column/Field Name Notes Item 2(a)(2) Asset Number With respect to Asset Number 1 original file reflected one loan with Original Loan Amount of 64000000 however this is now split into Asset Number 1, 1A, 1B, and 1C with Original Loan Amounts of 29100000, 17000000, 450000, and 17450000 respectively. Appraisal, financial, and property level information will only be reflected on Asset Number 1. Similar splits are reported for assets 2, 4, 5, and 6 Item 2(c)(1) Originator Name Originator Name(s) for co-originated loans include only the originator(s) of the note(s) contributed to the BMO 2025-C12 Mortgage Trust transaction. Item 2(c)(4) Original Loan Term Number For anticipated repayment date mortgage loans (if any): the original loan term number represents the term of the mortgage loan through the anticipated repayment date, rather than the actual Maturity Date. There are no anticipated repayment date mortgage loans included in the trust. Item 2(c)(7) Original Interest Rate Percentage The Original Interest Rate Percentage for the mortgage loan identified as Plymouth Meeting Executive Campus (Asset Number 9) has been truncated to eight decimal places due to EDGAR constraints. The value to full precision is 0.0780138888888889. Item 2(c)(8) Interest Rate Securitization Percentage The Interest Rate Securitization Percentage for the mortgage loan identified as Plymouth Meeting Executive Campus (Asset Number 9) has been truncated to eight decimal places due to EDGAR constraints. The value to full precision is 0.0780138888888889. Item 2(c)(15) Loan Structure Code For the mortgage loans identified as Washington Square (Asset Number 1), 32 Old Slip - Leased Fee (Asset Number 2), Cape Cod Mall (Asset Number 5), UOVO QPN (Asset Number 6), and Plymouth Meeting Executive Campus (Asset Number 9), each such mortgage loan is evidenced by one or more senior pari passu notes that are part of a whole loan that consists of the subject mortgage loan and one or more senior pari-passu notes and, if applicable, one or more subordinate notes. The other senior pari-passu notes and the subordinate notes are not included in the trust. Item 2(c)(22) Grace Days Allowed Number With respect to the mortgage loan identified as Dadeland Centre I & II (Asset Number 4), the 5-day grace period applies once per trailing 12-month period. Item 2(d)(1) Property Name For mortgage loans that are part of a whole loan, the related mortgaged property secures the entire whole loan, including one or more companion loans not included in the trust. Item 2(d)(2) Property Address For the mortgaged property identified as Tripoli Park (Asset Number 18) the property address of the mortgaged property are 5750 North 95th Street, 5760 North 95th Street, 9305 West Sheridan Avenue, 9580 West Fond Du Lac Avenue, 6345 North 91st Street and 6345-R North 91st Street, 3815 West Good Hope Road, 3827 West Good Hope Road, 5611 North 40th Street, 5127 North 76th Street and 7225 West Burleigh Street. For the mortgaged property identified as Estabrook & Fairview (Asset Number 28) the property address of the mortgaged property are 2453 West Capitol Drive, 2629 West Roosevelt Drive, 4292, 4282, 4275 and 4248 North 27th Street, 5301 and 5308 North 29th Street, 5909 North Teutonia Avenue, 6225-6227 West Fairview Avenue, 7404, 7414 and 7424 North 86th Street and 8631-8633 West Greenbrook Drive. For the mortgaged property identified as Enderis & Wells (Asset Number 30) the property address of the mortgaged property are 2944-2950 North 67th Street, 6665 West Lisbon Avenue, 3743-3745 West Wells Street, 4243 West Nash Street, 4468 North 76th Street, 5953 North 77th Street, 6515 West Florist Avenue and 9745 West Reichert Place. Item 2(d)(5) Property Zip For the mortgaged property identified as Tripoli Park (Asset Number 18) the zip codes of the mortgaged property are 53225, 53209, 53218 and 53222. For the mortgaged property identified as Estabrook & Fairview (Asset Number 28) the zip codes of the mortgaged property are 53206, 53209, 53213, 53216 and 53224. For the mortgaged property identified as Enderis & Wells (Asset Number 30) the zip codes of the mortgaged property are 53210, 53208, 53216, 53218 and 53225. 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 whole loan, net rentable square feet is presented for the entire mortgaged property that secures the whole loan, 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 whole loan, the net rentable square feet securitization number is presented for the entire mortgaged property that secures the whole loan, 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 whole loan, the units beds rooms number relates to the entire mortgaged property that secures the whole loan, 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 whole loan, the units beds rooms securitization number relates to the entire mortgaged property that secures the whole loan, including one or more companion loans not included in the trust. Item 2(d)(12) Year Built Number With respect to the mortgaged property identified as The Slip Leased Fee (Asset Number 2), the Year Built Number has been left blank because the related mortgage loan is secured by the fee interest in the mortgaged property, but not the improvements (subject to the provisions of the related ground lease) in the mortgaged property. Item 2(d)(14) Valuation Securitization Amount For mortgage loans that are part of a whole loan, the valuation securitization amount relates to the entire mortgaged property that secures the whole loan, 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 Item 2(d)(9) or Item 2(d)(11). With respect to the mortgaged property identified as The Slip Leased Fee (Asset Number 2), the Physical Occupancy Securitization Percentage has been left blank because the related mortgage loan is secured by the fee interest in the mortgaged property, but not the improvements (subject to the provisions of the related ground lease) in the mortgaged property. Item 2(d)(27)(iii) Lease Expiration Third Largest Tenant Date With respect to the asset identified as Washington Square (Asset Number 1), the Third Largest Tenant has a month-to-month lease. The Lease Expiration Third Largest Tenant Date is being presented as of the day prior to the cut-off date of the BMO 2025-C12 transaction. Item 2(d)(28)(i) Financials Securitization Date For the assets identified as 32 Old Slip - Leased Fee (Asset Number 2), 1301 Rocky Point Drive (Asset Number 14), and ABC Junction (Asset Number 23), the Financials Securitization Date has been left blank as it was not available at the time of securitization. Item 2(d)(28)(iv) Revenue Securitization Amount For mortgage loans that are part of a whole loan, the revenue securitization amount is presented for the entire mortgaged property that secures the whole loan, 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 whole loan, the total underwritten operating expenses securitization amount are presented for the entire mortgaged property that secures the whole loan, 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 whole loan, the net operating income securitization amount is presented for the entire mortgaged property that secures the whole loan, 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 whole loan, the net cash flow securitization amount is presented for the entire mortgaged property that secures the whole loan, 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 whole loan, 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. Item 2(d)(28)(xvii) Debt Service Coverage Net Cash Flow Securitization Percentage For mortgage loans that are part of a whole loan, 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. 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 whole loan) 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(k)(2) Modification Code If the loan is subject to a forbearance (or similar) agreement, this will be indicated by a code of "10" in the Column/Field Name "Modification Code". A loan subject to a forbearance (or similar) agreement will be reported as "current" as indicated with code 0 for so long as the related obligor is in compliance with the obligations regarding monthly debt payments contained in such agreement.