XML 46 R35.htm IDEA: XBRL DOCUMENT v2.4.0.6

Subsequent Events (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended						0 Months Ended	1 Months Ended	0 Months Ended
	Sep. 30, 2012 sqft	Jun. 30, 2012	Mar. 31, 2012	Sep. 30, 2011 sqft	Jun. 30, 2011	Mar. 31, 2011	Oct. 10, 2012 Subsequent Event Office property in Houston, Texas item sqft	Oct. 31, 2012 Subsequent Event Commercial property in Southfield, Michigan	Oct. 12, 2012 Subsequent Event Cash distribution declared
Subsequent events
Cash dividend declared per share	$ 0.19	$ 0.19	$ 0.19	$ 0.19	$ 0.19	$ 0.19			$ 0.19
Number of buildings agreed to be acquired by the entity							2
Area of property (in square foot)	7,439,195			6,929,891			629,000
Purchase price of property acquired in Houston, Texas							$ 154.8
Sale price of properties under the agreement								$ 0.7

X

- Definition

Represents the number of buildings agreed to be acquired by the entity during the period.

+ References

No definition available.

+ Details

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Namespace Prefix:	fsp_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represents the aggregate purchase price excluding closing costs and adjustments of real estate properties acquired by the entity during the period.

+ References

No definition available.

+ Details

Name:	fsp_RealEstateAggregatePurchasePrice
Namespace Prefix:	fsp_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Represents the sale price of the property agreed to be sold by the entity during the period.

+ References

No definition available.

+ Details

Name:	fsp_RealEstateAggregateSalesPrice
Namespace Prefix:	fsp_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Area of a real estate property.

+ References

No definition available.

+ Details

Name:	us-gaap_AreaOfRealEstateProperty
Namespace Prefix:	us-gaap_
Data Type:	num:areaItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Aggregate dividends declared during the period for each share of common stock outstanding.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.3-04)

-URI http://asc.fasb.org/extlink&oid=6959260&loc=d3e187085-122770

+ Details

Name:	us-gaap_CommonStockDividendsPerShareDeclared
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

X

- Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration