Spreadsheet: 1d8f925e-232b-42f3-8128-f1172c6da16b
Sheet: Primary Layout

ID: | 00130780 |  |  |  |  |  |  |  | Notes/Supplemental Information:
REIT Name: | Corporate Office Properties Trust
Tax Year: | 2012
Report Date (mm/dd/yyyy): | 2013-01-24 00:00:00 |  | TARGET DELIVERY DATE: JANUARY 18, 2013
This spreadsheet and the accompanying instructions do not constitute, and should not be considered a substitute for, legal advice.  The rules governing the proper tax characterization of distributions by REITs can be complex.  Each REIT should consult its own tax advisor regarding the proper tax characterization and reporting of the REIT's distributions.
Please list Securities in [NAME]
1 | 2 | 3 | 4 |  |  |  |  |  |  |  |  |  | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 |  |  |  |  |  |  |  |  |  |  | 32
 |  |  |  |  |  |  |  |  | Total | Year Included in Shareholders' Income |  |  |  | Form 1099 Box 1a Breakdown |  | Box 1a Total |  | Form 1099 Box 1b Breakdown |  | Box 1b Total | Box 2a | Box 2b | Box 2c | Box 2d | Box 3 | Box 6 | Box 8 | Box 9 |  |  | CUSIP
 |  |  |  |  |  |  |  |  | Distribution | 2011 | 2013 | 2012 |  |  | Foreign | Ordinary | Qualified | Qualified | Qualified | Qualified | Total Capital | Unrecap |  |  |  | Foreign | Cash | Noncash | Exempt | Percentage | Number
Security |  | Ticker | Estimated | Reclass | Corrected | Record | Ex-Dividend | Payable | Per Share | (Prior Year) | (Next Year) | (Current Year) | Income | Short-term | Tax | Dividends | Income | Short-term | Foreign Tax | Dividends | [NAME]. | Sec. 1250 | Section 1202 | Collectibles | Nondividend | Tax | Liquidation | Liquidation | Interest | of AMT | Change
Description | CUSIP | Symbol | (E) | (R) | (C) | Date | Date | Date | (11+12+13) |  |  | (14+15+22+26+28) | Dividends | Capital Gain | Paid | (14+15+16) | Dividends | Gains | Paid | (18+19+20) |  | Gain | Gain | (28%) Gain | Distributions | Paid | Distr | Distr | Dividends | in Column 30 | (M) or (Y)
Common | 22002T108 | OFC |  |  |  | 2012-03-31 00:00:00 |  | 2012-04-16 00:00:00 |  |  |  |  | 0.091244 |  |  |  | 0 |  |  |  |  |  |  |  | 0.183756
Common | 22002T108 | OFC |  |  |  | 2012-06-29 00:00:00 |  | 2012-07-16 00:00:00 |  |  |  |  | 0.091244 |  |  |  | 0 |  |  |  |  |  |  |  | 0.183756
Common | 22002T108 | OFC |  |  |  | 2012-09-12 00:00:00 |  | 2012-10-15 00:00:00 |  |  |  |  | 0.091244 |  |  |  | 0 |  |  |  |  |  |  |  | 0.183756
Common | 22002T108 | OFC |  |  |  | 2012-12-31 00:00:00 |  | 2013-01-15 00:00:00 |  |  | 0.275
 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1
Series G PFD | 22002T504 | OFC pg |  |  |  | 2012-03-31 00:00:00 |  | 2012-04-16 00:00:00 |  |  |  |  | 0.5
Series G PFD | 22002T504 | OFC pg |  |  |  | 2012-06-29 00:00:00 |  | 2012-07-16 00:00:00 |  |  |  |  | 0.5
Series G PFD | 22002T504 | OFC pg |  |  |  | 2012-08-01 00:00:00 |  | 2012-08-01 00:00:00 |  |  |  |  | 0.1222
Series G PFD | 22002T504 | OFC pg
 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1
Series H PFD | 22002T603 | OFC ph |  |  |  | 2012-03-31 00:00:00 |  | 2012-04-16 00:00:00 |  |  |  |  | 0.468
Series H PFD | 22002T603 | OFC ph |  |  |  | 2012-06-29 00:00:00 |  | 2012-07-16 00:00:00 |  |  |  |  | 0.468
Series H PFD | 22002T603 | OFC ph |  |  |  | 2012-09-12 00:00:00 |  | 2012-10-15 00:00:00 |  |  |  |  | 0.468
Series H PFD | 22002T603 | OFC ph |  |  |  | 2012-12-31 00:00:00 |  | 2013-01-15 00:00:00 |  |  | 0.468
 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1
Series J PFD | 22002T702 | OFC pj |  |  |  | 2012-03-31 00:00:00 |  | 2012-04-16 00:00:00 |  |  |  |  | 0.4766
Series J PFD | 22002T702 | OFC pj |  |  |  | 2012-06-29 00:00:00 |  | 2012-07-16 00:00:00 |  |  |  |  | 0.4766
Series J PFD | 22002T702 | OFC pj |  |  |  | 2012-09-12 00:00:00 |  | 2012-10-15 00:00:00 |  |  |  |  | 0.4766
Series J PFD | 22002T702 | OFC pj |  |  |  | 2012-12-31 00:00:00 |  | 2013-01-15 00:00:00 |  |  | 0.4766
 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1
Series K PFD | 22002T801 | OFC pk |  |  |  | 2012-03-31 00:00:00 |  | 2012-04-16 00:00:00 |  |  |  |  | 0.7
Series K PFD | 22002T801 | OFC pk |  |  |  | 2012-06-29 00:00:00 |  | 2012-07-16 00:00:00 |  |  |  |  | 0.7
Series K PFD | 22002T801 | OFC pk |  |  |  | 2012-09-12 00:00:00 |  | 2012-10-15 00:00:00 |  |  |  |  | 0.7
Series K PFD | 22002T801 | OFC pk |  |  |  | 2012-12-31 00:00:00 |  | 2013-01-15 00:00:00 |  |  | 0.7
 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1
Series L PFD | 22002T884 | OFC pl |  |  |  | 2012-09-12 00:00:00 |  | 2012-10-15 00:00:00 |  |  |  |  | 0.5531
Series L PFD | 22002T884 | OFC pl |  |  |  | 2012-12-31 00:00:00 |  | 2013-01-15 00:00:00 |  |  | 0.4609
 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1
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