POWER OF ATTORNEY
                  FOR SEC FILINGS ON FORMS ID, 3, 4, 5 AND 144
                          IN RESPECT OF SECURITIES OF
                      RETAIL OPPORTUNITY INVESTMENTS CORP.


       The undersigned hereby constitutes and appoints each of Steven Chuslo,
Katherine Dent, Jay Bernstein, Michael Kessler and Max Clarke or any one of them
acting alone, as his true and lawful attorney-in-fact and agent, with full power
of substitution and resubstitution for his in his name and stead in any and all
capacities, to sign and file for and on his behalf, in respect of any
acquisition, disposition or other change in beneficial ownership of any shares
of common stock, par value $0.01 per share, of Hannon Armstrong Sustainable
Infrastructure Capital, Inc. (the "Company"), the following:

       (i)     any Form ID to be filed with the Securities and Exchange
       Commission (the "SEC");

       (ii)    any Initial Statement of Beneficial Ownership of Securities on
       Form 3 to be filed with the SEC;

       (iii)   any Statement of Changes of Beneficial Ownership of Securities on
       Form 4 to be filed with the SEC;

       (iv)    any Annual Statement of Beneficial Ownership of Securities on
       Form 5 to be filed with the SEC;

       (v)     any Notice of Proposed Sale of Securities on Form 144 to be filed
       with the SEC; and

       (vi)    any and all agreements, certificates, receipts, or other
       documents in connection therewith.

       The undersigned hereby gives full power and authority to the attorney-in-
fact to seek and obtain as the undersigned's representative and on the
undersigned's behalf, information on transactions in the Company's securities
from any third party, including brokers, employee benefit plan administrators
and trustees, and the undersigned hereby authorizes any such person to release
such information to the undersigned and approves and ratifies any such release
of information.

       The undersigned hereby grants unto such attorney-in-fact and agent full
power and authority to do and perform each and every act and thing requisite and
necessary in connection with such matters and hereby ratifies and confirms all
that any such attorney-in-fact and agent or substitute may do or cause to be
done by virtue hereof.

The undersigned acknowledges that:

       (i)     neither the Company nor such attorney-in-fact assumes (i) any
       liability for the undersigned's responsibility to comply with the
       requirement of the Securities Exchange Act of 1934, as amended (the
       "Exchange Act"), (ii) any liability of the undersigned for any failure to
       comply with such requirements or (iii) any obligation or liability of the
       undersigned for profit disgorgement under Section 16(b) of the Exchange
       Act; and

       (ii)    this Power of Attorney does not relieve the undersigned from
       responsibility for compliance with the undersigned's obligations under
       the Exchange Act, including without limitation the reporting requirements
       under Section 16 of the Exchange Act.

       This Power of Attorney shall remain in full force and effect until
revoked by the undersigned in a signed writing delivered to such attorney-in-
fact.

IN WITNESS WHEREOF, the undersigned has executed this Power of Attorney.

Date: January 13, 2015               /s/ Steven G. Osgood
                                     --------------------
                                        STEVEN G. OSGOOD