Exhibit 31.2

CERTIFICATIONS



I, Barbara J. Fournier,
certify that:



1.	I have
reviewed this Annual Report on Form 10-K of FSP 50 South Tenth Street Corp.;



2.	Based
on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary
to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to
the period covered by this report;



3.	Based
on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material
respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented
in this report;



4.	The registrant’s
other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined
in Exchange Act Rules 13a-15(e) and 15d-15(e)) for the registrant and internal control over financial reporting (as defined in
Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:



(a)	Designed
such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision,
to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by
others within those entities, particularly during the period in which this report is being prepared;

(b)	Designed
such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our
supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial
statements for external purposes in accordance with generally accepted accounting principles;

(c)	Evaluated
the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about
the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation;
and

(d)	Disclosed
in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s
most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected,
or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5.	The registrant’s
other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting,
to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing
the equivalent functions):



(a)	All
significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which
are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information;
and

(b)	Any
fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s
internal control over financial reporting.



|Date: March 11, 2011 | /s/ Barbara J. Fournier                              
|-------------------- | -----------------------------------------------------
|                     | Barbara J. Fournier                                  
|                     | Chief Operating Officer (Principal Financial Officer)