-Network: (11 - Statement - Statement Of Financial Position Unclassified - Real Estate Operations)

-Statement of Financial Position [Abstract] {ID1}

-Statement [Table] {ID2}

-Statement [Line Items] {ID3}

-ASSETS {ID4}

Real estate, at cost {ID5}

Construction in process {ID6}

Land held for future development {ID7}

Less: accumulated depreciation {ID8}

Total real estate {ID9}

Cash and cash equivalents {ID10}

Cash held in escrows {ID11}

Investments in securities {ID12}

Tenant and other receivables (net of allowance for doubtful accounts of $4,618 and $4,006, respectively) {ID13}

Related party note receivable {ID14}

Accrued rental income (net of allowance of $2,698 and $15,440, respectively) {ID15}

Deferred charges, net {ID16}

Prepaid expenses and other assets {ID17}

Investments in unconsolidated joint ventures {ID18}

Total assets {ID19}

-LIABILITIES AND EQUITY {ID20}

-Liabilities: {ID21}

Mortgage notes payable {ID22}

Unsecured senior notes (net of discount of $2,383 and $2,625, respectively) {ID23}

Unsecured exchangeable senior notes (net of discount of $18,387 and $21,101, respectively) {ID24}

Unsecured line of credit {ID25}

Accounts payable and accrued expenses {ID26}

Dividends and distributions payable {ID27}

Accrued interest payable {ID28}

Other liabilities {ID29}

Total liabilities {ID30}

Commitments and contingencies {ID31}

-Noncontrolling interest: {ID32}

Redeemable preferred units of the Operating Partnership {ID33}

-Equity: {ID34}

-Stockholders' equity attributable to Boston Properties, Inc.: {ID35}

Excess stock, $.01 par value, 150,000,000 shares authorized, none issued or outstanding {ID36}

Preferred stock, $.01 par value, 50,000,000 shares authorized, none issued or outstanding {ID37}

Common stock, $.01 par value, 250,000,000 shares authorized, 138,627,561 and 121,259,555 issued and 138,548,661 and 121,180,655 outstanding in 2009 and 2008, respectively {ID38}

Additional paid-in capital {ID39}

Earnings in excess of dividends {ID40}

Treasury common stock at cost, 78,900 shares in 2009 and 2008 {ID41}

Accumulated other comprehensive loss {ID42}

Total stockholders' equity attributable to Boston Properties, Inc. {ID43}

-Noncontrolling interests: {ID44}

Common units of the Operating Partnership {ID45}

Property partnerships {ID46}

Total equity {ID47}

Total liabilities and equity {ID48}

-Network: (12 - Statement - Statement Of Financial Position Unclassified - Real Estate Operations (Parenthetical))

-Statement of Financial Position [Abstract] {ID49}

-Statement [Table] {ID50}

-Statement [Line Items] {ID51}

Tenant and other receivables, allowance for doubtful accounts {ID52}

Accrued rental income, allowance {ID53}

Unsecured senior notes, discount {ID54}

Unsecured exchangeable senior notes, discount {ID55}

Excess stock, par value {ID56}

Excess stock, shares authorized {ID57}

Excess stock, issued {ID58}

Excess stock, outstanding {ID59}

Preferred stock, par value {ID60}

Preferred stock, shares authorized {ID61}

Preferred stock, issued {ID62}

Preferred stock, outstanding {ID63}

Common stock, par value {ID64}

Common stock, shares authorized {ID65}

Common stock, issued {ID66}

Common stock, outstanding {ID67}

Treasury common stock, shares {ID68}

-Network: (13 - Statement - Statement Of Income Real Estate Excluding REITs)

-Income Statement [Abstract] {ID69}

-Statement [Table] {ID70}

-Statement [Line Items] {ID71}

-Revenue {ID72}

-Rental: {ID73}

Base rent {ID74}

Recoveries from tenants {ID75}

Parking and other {ID76}

Total rental revenue {ID77}

Hotel revenue {ID78}

Development and management services {ID79}

Interest and other {ID80}

Total revenue {ID81}

-Expenses {ID82}

-Real estate operating: {ID83}

Rental {ID84}

Hotel {ID85}

General and administrative {ID86}

Interest {ID87}

Depreciation and amortization {ID88}

Loss from suspension of development {ID89}

Net derivative losses {ID90}

Losses from early extinguishments of debt {ID91}

Losses (gains) from investments in securities {ID92}

Total expenses {ID93}

Income before income (loss) from unconsolidated joint ventures, gains on sales of real estate and net income attributable to noncontrolling interests {ID94}

Income (loss) from unconsolidated joint ventures {ID95}

Gains on sales of real estate {ID96}

Net income {ID97}

-Net income attributable to noncontrolling interests: {ID98}

Noncontrolling interests in property partnerships {ID99}

Noncontrolling interest-common units of the Operating Partnership {ID100}

Noncontrolling interest in gains on sales of real estate-common units of the Operating Partnership {ID101}

Noncontrolling interest-redeemable preferred units of the Operating Partnership {ID102}

Net income attributable to Boston Properties, Inc. {ID103}

-Basic earnings per common share attributable to Boston Properties, Inc.: {ID104}

Net income {ID105}

Weighted average number of common shares outstanding {ID106}

-Diluted earnings per common share attributable to Boston Properties, Inc.: {ID107}

Net income {ID108}

Weighted average number of common shares outstanding-diluted {ID109}

-Network: (14 - Statement - Statement Of Other Comprehensive Income)

-Statement of Income and Comprehensive Income [Abstract] {ID110}

-Statement [Table] {ID111}

-Statement [Line Items] {ID112}

Net income {ID113}

-Other comprehensive income (loss): {ID114}

Net effective portion of interest rate contracts {ID115}

Amortization of interest rate contracts {ID116}

Other comprehensive income (loss) {ID117}

Comprehensive income {ID118}

Comprehensive income attributable to noncontrolling interests {ID119}

Comprehensive income attributable to Boston Properties, Inc. {ID120}

-Network: (15 - Statement - Statement Of Cash Flows Indirect Real Estate)

-Statement of Cash Flows [Abstract] {ID121}

-Statement [Table] {ID122}

-Statement [Line Items] {ID123}

-Cash flows from operating activities: {ID124}

Net income {ID125}

-Adjustments to reconcile net income to net cash provided by operating activities: {ID126}

Depreciation and amortization {ID127}

Non-cash portion of interest expense {ID128}

Non-cash compensation expense {ID129}

Non-cash rental revenue {ID130}

Losses from early extinguishments of debt {ID131}

Net derivative losses {ID132}

Losses (gains) from investments in securities {ID133}

Loss from suspension of development {ID134}

Income from unconsolidated joint ventures {ID135}

Distributions of net cash flow from operations of unconsolidated joint ventures {ID136}

Gains on sales of real estate {ID137}

-Change in assets and liabilities: {ID138}

Cash held in escrows {ID139}

Tenant and other receivables, net {ID140}

Accrued rental income, net {ID141}

Prepaid expenses and other assets {ID142}

Accounts payable and accrued expenses {ID143}

Accrued interest payable {ID144}

Other liabilities {ID145}

Tenant leasing costs {ID146}

Total adjustments {ID147}

Net cash provided by operating activities {ID148}

-Cash flows from investing activities: {ID149}

Acquisitions/additions to real estate {ID150}

Proceeds from redemptions of investments in securities {ID151}

Net investments in unconsolidated joint ventures {ID152}

Net proceeds from the sale/financing of real estate released from escrow {ID153}

Issuance of note receivable {ID154}

Proceeds from note receivable {ID155}

Net proceeds from the sales of real estate {ID156}

Net cash used in investing activities {ID157}

-Cash flows from financing activities: {ID158}

Borrowings on unsecured line of credit {ID159}

Repayments of unsecured line of credit {ID160}

Proceeds from mortgage notes payable {ID161}

Repayments of mortgage notes payable {ID162}

Payments on real estate financing transactions {ID163}

Advance from joint venture partners {ID164}

Dividends and distributions {ID165}

Net proceeds from equity transactions {ID166}

Distributions to noncontrolling interests in property partnerships, net {ID167}

Repayment of note payable {ID168}

Deferred financing costs {ID169}

Net cash provided by (used in) in financing activities {ID170}

Net increase (decrease) in cash and cash equivalents {ID171}

Cash and cash equivalents, beginning of period {ID172}

Cash and cash equivalents, end of period {ID173}

-Supplemental disclosures: {ID174}

Cash paid for interest {ID175}

Interest capitalized {ID176}

-Non-cash investing and financing activities: {ID177}

Additions to real estate included in accounts payable {ID178}

Dividends and distributions declared but not paid {ID179}

Issuance of OP Units in connection with the acquisition of real estate {ID180}

Issuance of OP Units in connection with an investment in an unconsolidated joint venture {ID181}

Conversions of Noncontrolling interests to Stockholders' equity {ID182}

Basis adjustment to real estate in connection with conversions of Noncontrolling interests to Stockholders' equity {ID183}

Note receivable issued in connection with the transfer of real estate {ID184}

Issuance of restricted securities to employees and directors {ID185}

-Network: (16 - Disclosure - Notes to Financial Statements)

-Notes to Financial Statements [Abstract] {ID186}

1. Organization {ID187}

2. Basis of Presentation and Summary of Significant Accounting Policies {ID188}

3. Real Estate Activity During the Six Months Ended June 30, 2009 {ID189}

4. Investments in Unconsolidated Joint Ventures {ID190}

5. Mortgage Notes Payable {ID191}

6. Unsecured Exchangeable Senior Notes {ID192}

7. Commitments and Contingencies {ID193}

8. Noncontrolling Interests {ID194}

9. Stockholders' Equity {ID195}

10. Earnings Per Share {ID196}

11. Stock Option and Incentive Plan {ID197}

12. Segment Information {ID198}

13. Newly Issued Accounting Standards {ID199}

14. Subsequent Events {ID200}

-Network: (17 - Disclosure - Document Information)

-Document Information [Text Block] {ID201}

Document Type {ID202}

Amendment Flag {ID203}

Amendment Description {ID204}

Document Period End Date {ID205}

-Network: (18 - Disclosure - Entity Information)

-Entity [Text Block] {ID206}

Trading Symbol {ID207}

Entity Registrant Name {ID208}

Entity Central Index Key {ID209}

Current Fiscal Year End Date {ID210}

Entity Well-known Seasoned Issuer {ID211}

Entity Current Reporting Status {ID212}

Entity Voluntary Filers {ID213}

Entity Filer Category {ID214}

Entity Common Stock, Shares Outstanding {ID215}

Entity Public Float {ID216}

BOSTON PROPERTIES INC XBRL Taxonomy Presentation Networks