    <SEC-DOCUMENT>0001193125-26-318826-index.html : 20260728
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    <ACCEPTANCE-DATETIME>20260728064517
    ACCESSION NUMBER:		0001193125-26-318826
    CONFORMED SUBMISSION TYPE:	8-K
    PUBLIC DOCUMENT COUNT:		15
    CONFORMED PERIOD OF REPORT:	20260728
    ITEM INFORMATION:		Results of Operations and Financial Condition
    ITEM INFORMATION:		Financial Statements and Exhibits
    FILED AS OF DATE:		20260728
    DATE AS OF CHANGE:		20260728

    FILER:

    	COMPANY DATA:
    		COMPANY CONFORMED NAME:			Curbline Properties Corp.
    		CENTRAL INDEX KEY:			0002027317
    		STANDARD INDUSTRIAL CLASSIFICATION:	REAL ESTATE [6500]
    		ORGANIZATION NAME:           	05 Real Estate & Construction
    		EIN:				934224532
    		STATE OF INCORPORATION:			MD
    		FISCAL YEAR END:			1231

    	FILING VALUES:
    		FORM TYPE:		8-K
    		SEC ACT:		1934 Act
    		SEC FILE NUMBER:	001-42265
    		FILM NUMBER:		261207470

    	BUSINESS ADDRESS:
    		STREET 1:		320 PARK AVENUE
    		CITY:			NEW YORK
    		STATE:			NY
    		ZIP:			10022
    		BUSINESS PHONE:		216-755-5500

    	MAIL ADDRESS:
    		STREET 1:		3300 ENTERPRISE PARKWAY
    		CITY:			BEACHWOOD
    		STATE:			OH
    		ZIP:			44122
    </SEC-HEADER>
    <DOCUMENT>
    <TYPE>8-K
    <SEQUENCE>1
    <FILENAME>curb-20260728.htm
    <DESCRIPTION>8-K
    <TEXT>
    Document 1 - file: curb-20260728.htm

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    <FILENAME>curb-ex99_1.htm
    <DESCRIPTION>EX-99.1
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    Document 2 - file: curb-ex99_1.htm

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    <TYPE>GRAPHIC
    <SEQUENCE>3
    <FILENAME>img220075523_0.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 3 - file: img220075523_0.jpg

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    <SEQUENCE>4
    <FILENAME>img220075523_1.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 4 - file: img220075523_1.jpg

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    <DESCRIPTION>GRAPHIC
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    <DESCRIPTION>GRAPHIC
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    <SEQUENCE>7
    <FILENAME>img220075523_4.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 7 - file: img220075523_4.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-101.SCH
    <SEQUENCE>8
    <FILENAME>curb-20260728.xsd
    <DESCRIPTION>XBRL TAXONOMY EXTENSION SCHEMA WITH EMBEDDED LINKBASES DOCUMENT
    <TEXT>
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    <DOCUMENT>
    <TYPE>XML
    <SEQUENCE>10
    <FILENAME>R1.htm
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
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    <DOCUMENT>
    <TYPE>XML
    <SEQUENCE>11
    <FILENAME>report.css
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
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    <DOCUMENT>
    <TYPE>XML
    <SEQUENCE>12
    <FILENAME>Show.js
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
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    <DOCUMENT>
    <TYPE>XML
    <SEQUENCE>14
    <FILENAME>FilingSummary.xml
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
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    Document 14 - RAW XML: FilingSummary.xml

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    <DOCUMENT>
    <TYPE>JSON
    <SEQUENCE>16
    <FILENAME>MetaLinks.json
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 16 - file: MetaLinks.json

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    <DOCUMENT>
    <TYPE>ZIP
    <SEQUENCE>17
    <FILENAME>0001193125-26-318826-xbrl.zip
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
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    <DOCUMENT>
    <TYPE>XML
    <SEQUENCE>18
    <FILENAME>curb-20260728_htm.xml
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    <TEXT>
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    Document 18 - RAW XML: curb-20260728_htm.xml

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