Mack Cali Realty L P 10-K/A 24 Apr 20 2019 FY Annual report (amended) Financial data

Cover

Cover - USD ($)	12 Months Ended
	Dec. 31, 2019	Feb. 24, 2020	Jun. 30, 2019
Entity Information [Line Items]
Document Type	10-K/A
Amendment Flag	false
Document Annual Report	true
Document Transition Report	false
Document Period End Date	Dec. 31, 2019
Document Fiscal Period Focus	FY
Document Fiscal Year Focus	2019
Current Fiscal Year End Date	--12-31
Entity File Number	1-13274
Entity Registrant Name	MACK-CALI REALTY CORPORATION
Entity Central Index Key	0000924901
Entity Tax Identification Number	22-3305147
Entity Incorporation, State or Country Code	MD
Entity Address, Address Line One	Harborside 3
Entity Address, Address Line Two	210 Hudson St.
Entity Address, Address Line Three	Ste. 400
Entity Address, City or Town	Jersey City
Entity Address, State or Province	NJ
Entity Address, Postal Zip Code	07311
City Area Code	732
Local Phone Number	590-1010
Title of 12(b) Security	Common Stock, $0.01 par value
Trading Symbol	CLI
Security Exchange Name	NYSE
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Public Float			$ 2,102,611,115
Entity Common Stock, Shares Outstanding		90,595,470
Mack-Cali Realty LP [Member]
Entity Information [Line Items]
Document Type	10-K/A
Amendment Flag	false
Document Period End Date	Dec. 31, 2019
Document Fiscal Period Focus	FY
Document Fiscal Year Focus	2019
Current Fiscal Year End Date	--12-31
Entity File Number	333-57103
Entity Registrant Name	MACK-CALI REALTY, L.P.
Entity Central Index Key	0001067063
Entity Tax Identification Number	22-3315804
Entity Incorporation, State or Country Code	DE
Entity Address, Address Line One	Harborside 3
Entity Address, Address Line Two	210 Hudson St.
Entity Address, Address Line Three	Ste. 400
Entity Address, City or Town	Jersey City
Entity Address, State or Province	NJ
Entity Address, Postal Zip Code	07311
City Area Code	732
Local Phone Number	590-1010
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false