Exhibit 4.5

FORM OF ESCROW AGREEMENT

THIS ESCROW AGREEMENT(this Agreement) made and entered into as of this 22 day of June, 2010 by and among Wells Investment
Securities, Inc., a Georgia corporation (the Dealer Manager), Wells Core Office Income REIT, Inc., a Maryland corporation (the Company), and UMB Bank, N.A., as escrow agent, a national banking association
organized and existing under the laws of the United States of America (the Escrow Agent).

RECITALS

WHEREAS, the Company proposes to offer and sell shares of common stock (the Shares), on a
best-efforts basis, for at least $2,500,000 and up to $5,000,000,000 of gross proceeds (excluding the shares of its common stock to be offered and sold pursuant to the Companys distribution reinvestment plan), at an initial purchase price of
$25.00 per share (the Offering) to investors pursuant to the Companys Registration statement on Form S-11 (File No. 333-163411), as amended from time to time (the Offering Document).

WHEREAS, the Dealer Manager will be engaged by the Company to offer and sell the Shares on a best efforts basis through a network
of participating broker-dealers (the Dealers).

WHEREAS, the Company has agreed that the
subscription price paid by subscribers for shares will be refunded to such subscribers if at least $2,500,000 of gross offering proceeds from persons who are not affiliated with the Company or Wells Real Estate Advisory Services III, LLC (the
Advisor) (the Minimum Offering) has not been raised within one year from the date the Offering Document becomes effective with the Securities and Exchange Commission (the Closing Date,).

WHEREAS, the Dealer Manager and the Company desire to establish an escrow account (the Escrow
Account), as further described herein in which funds received from subscribers will, except as otherwise specified herein, be deposited into an account entitled Wells Core Office Income REIT, Inc. Subscription Account and the
Company desires that the Escrow Agent act as escrow agent to the Escrow Account and Escrow Agent is willing to act in such capacity.

WHEREAS, deposits received from residents of the State of Pennsylvania (the Pennsylvania Subscribers) will
remain in the Escrow Account until the conditions of Section 3 hereof has been met.

WHEREAS, the Escrow Agent has
engaged Boston Financial Data Services, Inc. (the Transfer Agent) to examine for good order subscriptions and to act as record keeper, maintaining on behalf of the Escrow Agent the ownership records for the Escrow
Account. In so acting the Transfer Agent shall be acting solely in the capacity of agent for the Escrow Agent and not in any capacity on behalf of the Company or the Dealer Manager.

WHEREAS, in order to subscribe for Shares during the Escrow Period (as defined below), a subscriber must deliver the full amount
of the purchase price for its subscription: (i) by check made payable to the order of UMB Bank, N.A., as Escrow Agent for Wells Core Office



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Income REIT, Inc. in U.S. dollars or (ii) by draft, wire transfer of immediately available funds or Automated ClearingHouse (ACH) in U.S. dollars transmitted directly to the Escrow Account
made payable as provided in Section 11(2) (collectively, the Payment Instruments).

AGREEMENT

NOW, THEREFORE, the Dealer Manager, the Company and Escrow Agent agree to the terms of this Agreement as follows:

1. Establishment of Escrow Account; Escrow Period. On or prior to the commencement of the offering of Shares pursuant to the Offering
Document, the Company shall establish the Escrow Account with the Escrow Agent, which shall be entitled UMB Bank, N.A., as Escrow Agent for Wells Core Office Income REIT, Inc. This Agreement shall be effective on the date on which the
Offering Document becomes effective. Except as otherwise set forth herein for the Pennsylvania Subscribers, the escrow period shall commence upon the effectiveness of this Agreement and shall continue until the earlier of (i) the date upon
which the Escrow Agent receives confirmation from the Company and the Dealer Manager that the Company has raised the Minimum Offering, (ii) the Closing Date, or (iii) the termination of the Offering by the Company prior to the receipt of
the Minimum Offering (the Escrow Period).

2. Operation of the Escrow.

(a) Deposits in the Escrow Account. During the Escrow Period, persons subscribing to purchase Shares will be instructed by the
Company, the Dealer Manager and the Dealers to make checks for subscriptions payable to the order of UMB Bank, N.A., as Escrow Agent for Wells Core Office Income REIT, Inc. Completed subscription agreements and Payment Instruments for
the purchase price shall be remitted by the broker dealers or registered investment advisors, as applicable, on behalf of persons subscribing to purchase Shares directly to the Escrow Agent as provided for in Section 11(2) within the time
periods required by Rule 15c2-4 of the Securities Exchange Act of 1934, as amended. The Escrow Agent hereby agrees to maintain the funds contributed by the Pennsylvania Subscribers in a manner in which they may be separately accounted for by the
records of the Transfer Agent so that the requirements of Section 3 of this Agreement can be met. Deposits shall be held in the Escrow Account until such funds are disbursed in accordance with this Agreement. Prior to disbursement of the funds
deposited in the Escrow Account, upon receipt of the Payment Instruments, Escrow Agent shall fax or scan a listing of the subscriber name and purchase price to the Transfer Agent, together with all other subscription documents sent with the Payment
Instruments. Prior to disbursement of the funds deposited in the Escrow Account, such funds shall not be subject to claims by creditors of the Company or any of its affiliates. If any of the Payment Instruments are returned to the Escrow Agent for
nonpayment prior to receipt of the Break Escrow Affidavit (as described below), the Escrow Agent shall promptly notify the Transfer Agent and the Company in writing via mail, email or facsimile of such nonpayment, and the Escrow Agent is authorized
to debit the Escrow Account, as applicable in the amount of such returned payment and the Transfer Agent shall delete the appropriate account from the records maintained by the Transfer Agent. Within 30 days from the date of receipt of each
subscription, the Company will determine whether or not the subscription is to be accepted or rejected in whole or in part. Within 10 business days of receipt by the Escrow Agent of written notice from the Company, or as soon thereafter as
practicable, that a subscription has been rejected, the Escrow Agent shall transfer by check the funds and all



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interest, if any, earned thereon, of any subscribers whose subscription has been rejected since the commencement of the Offering. The Transfer Agent will maintain a written account of each sale,
which account shall set forth, among other things, the following information: (i) the subscribers name and address, (ii) the subscribers social security number, (iii) the number of Shares purchased by such subscriber, and
(iv) the amount paid by such subscriber for such Shares. During the Escrow Period neither the Company nor the Dealer Manager will be entitled to any principal funds received into the Escrow Account.

(b) Distribution of the Funds in the Escrow Account to Subscribers other than the Pennsylvania Subscribers. If at any time on or
prior to the Closing Date, the Minimum Offering has been raised, then upon the happening of such event, the funds in the Escrow Account shall remain in the Escrow Account until the Escrow Agent receives written direction provided by the Company and
the Dealer Manager instructing the Escrow Agent to disburse to the Company, as the Company shall direct, the principal amount of such escrowed funds together with any interest earned thereon (other than any funds received from Pennsylvania
Subscribers, which cannot be released until the conditions of Section 3 has been met); provided, however, that the Escrow Agent shall not disburse the funds of a subscriber, the subscription of which has been rejected or rescinded, if the
Escrow Agent has been notified by the Company of such rejection or rescission. An affidavit or certification from an officer of the Company and an officer of the Dealer Manager to the Escrow Agent and Transfer Agent stating that at least the Minimum
Offering has been timely raised, shall constitute sufficient evidence for the purpose of this Agreement that such event has occurred (the Break Escrow Affidavit). The Affidavit shall indicate (i) the date on which the Minimum
Offering was raised and (ii) the actual total number of Shares sold as of such date.

(c) If the Escrow Agent has not
received a Break Escrow Affidavit on or prior to the Closing Date, the Escrow Agent shall promptly create and dispatch checks and wires drawn on the Escrow Account to return the principal amount of the funds in the Escrow Account to the subscribers,
together with their pro rata share of any interest earned thereon, and the Escrow Agent shall notify the Company and the Dealer Manager of its distribution of the funds. The subscription payments returned to each subscriber (including those, if any,
returned to Pennsylvania subscribers pursuant to Section 3) shall be free and clear of any and all claims of the Company or any of its creditors.



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3. Distribution of the Funds from Pennsylvania Subscribers.

(a) Notwithstanding anything to the contrary herein, disbursements of funds contributed by Pennsylvania Subscribers may only be
distributed in compliance with the provisions of this Section 3. Irrespective of any disbursement of funds from the Escrow Account pursuant to Section 2 hereof, the Escrow Agent will continue to place deposits from the Pennsylvania
Subscribers into the Escrow Account, until such time as the Company notifies the Escrow Agent in writing that total subscriptions (including amounts in the Escrow Account previously disbursed as directed by the Company and the amounts then held in
the Escrow Account) equal or exceed $166,700,000, whereupon the Escrow Agent shall disburse to the Company, as the Company shall direct, the principal amount of the funds from the Pennsylvania Subscribers received by the Escrow Agent for accepted
subscriptions together with any interest earned thereon. However, the Escrow Agent shall not disburse to the Company those funds of a subscriber, the subscription of which has been rejected or rescinded, if the Escrow Agent has been notified by the
Company of such rejection or rescission.

(b) If the Company has not received total subscriptions of at least $166,700,000
within 120 days of the date the Company first receives a subscription from a Pennsylvania Subscriber (the Initial Escrow Period), the Company shall notify each Pennsylvania Subscriber by certified mail or any other means (whereby receipt
of delivery is obtained) of the right of Pennsylvania Subscribers to have their investment returned to them. If, pursuant to such notice, a Pennsylvania Subscriber requests the return of his or her subscription funds within ten (10) days after
receipt of the notification (the Request Period), the Escrow Agent shall promptly refund directly to each Pennsylvania Subscriber the principal amount of the funds deposited in the Escrow Account on behalf of the Pennsylvania Subscriber.

(c) The funds of Pennsylvania Subscribers who do not request the return of their funds within the Request Period shall remain
in the Escrow Account for successive 120-day escrow periods (each a Successive Escrow Period), each commencing automatically upon the termination of the prior Successive Escrow Period, and the Company and Escrow Agent shall follow the
notification and payment procedure set forth in Section 3(b) above with respect to the Initial Escrow Period for each Successive Escrow Period, provided that any refunds made to a Pennsylvania Subscriber after a Successive Escrow Period shall
include a pro rata share of any interest earned thereon after the Initial Escrow Period, until the occurrence of the earliest of (i) the termination of the offering by the Company prior to the receipt of $166,700,000 of total subscriptions,
(ii) the receipt and acceptance by the Company of total subscriptions that equal or exceed $166,700,000 and the disbursement of the Escrow Account on the terms specified in this Section 3, or (iii) all funds held in the Escrow Account
that were contributed by Pennsylvania Subscribers having been returned to the Pennsylvania Subscribers in accordance with the provisions hereof.

(d) If the Company has not received and accepted total subscriptions of at least $166,700,000 within 365 days after the Closing Date, all
funds in the Escrow Account that were contributed by Pennsylvania Subscribers will be promptly returned in full to such Pennsylvania Subscribers, together with their pro rata share of any interest earned thereon



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pursuant to instructions made by the Company, upon which the Escrow Agent may conclusively rely.

4. Funds in the Escrow Account. Upon receipt of funds from subscribers to the Offering, the Escrow Agent shall hold such funds in escrow pursuant
to the terms of this Agreement. All such funds held in the Escrow Account shall be invested and reinvested in accounts and investments permitted under Rule 15c2-4 of the Securities Exchange Act of 1934, as amended, at the direction of the Company.
All funds in the Escrow Account shall at all times be placed in interest-bearing accounts unless otherwise determined by the Company (except for the funds from Pennsylvania Subscribers in the Escrow Account which must be maintained in an
interest-bearing account following the Initial Escrow Period).

The Escrow Agent shall be entitled to sell or redeem any such
investment as necessary to make any distributions required under this Agreement and shall not be liable or responsible for any loss resulting from any such sale or redemption.

Income, if any, resulting from the investment of the funds in the Escrow Account shall be distributed according to this Agreement.

The Escrow Agent shall provide to the Company monthly statements (or more frequently as reasonably requested by the Company)
on the account balance in the Escrow Account and the activity in the account since the last report.

5. Duties of the Escrow Agent. The
Escrow Agent shall have no duties or responsibilities other than those expressly set forth in this Agreement, and no implied duties or obligations shall be read into this Agreement against the Escrow Agent. The Escrow Agent is not a party to, or
bound by, any other agreement among the other parties hereto with respect to the subject matter hereof, and the Escrow Agents duties shall be determined solely by reference to this Agreement. The Escrow Agent shall have no duty to enforce any
obligation of any person, other than as provided herein. The Escrow Agent shall be under no liability to anyone by reason of any failure on the part of any party hereto or any maker, endorser or other signatory of any document or any other person to
perform such persons obligations under any such document.

6. Liability of the Escrow Agent and the Transfer Agent;
Indemnification. The Escrow Agent acts hereunder as a depository only. The Escrow Agent is not responsible or liable in any manner for the sufficiency, correctness, genuineness or validity of this Escrow Agreement or with respect to the form of
execution of the same. Each of the Escrow Agent and the Transfer Agent shall not be liable for any action taken or omitted by it, or any action suffered by it to be taken or omitted, in good faith, and in the exercise of its own best judgment, and
may rely conclusively and shall be protected in acting upon any order, notice, demand, certificate, opinion or advice of counsel (including counsel chosen by the Escrow Agent or the Transfer Agent), statement, instrument, report or other paper or
document (not only as to its due execution and the validity and effectiveness of its provisions, but also as to the truth and acceptability of any information therein contained) which is believed by the Escrow Agent or the Transfer Agent to be
genuine and to be signed or presented by the proper person(s). Each of the Escrow Agent and the Transfer Agent shall not be held liable for any error in judgment made in good faith by an officer or employee of either unless it shall be proved that
the Escrow Agent or the Transfer Agent, as appropriate, was grossly negligent or reckless in ascertaining the pertinent facts or acted



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intentionally in bad faith. The Escrow Agent shall not be bound by any notice of demand, or any waiver, modification, termination or rescission of this Agreement or any of the terms hereof,
unless evidenced by a writing delivered to the Escrow Agent signed by the proper party or parties and, if the duties or rights of the Escrow Agent are affected, unless it shall give its prior written consent thereto.

Either of the Escrow Agent and the Transfer Agent may consult legal counsel and shall exercise reasonable care in the selection of such counsel, in the
event of any dispute or question as to the construction of any provisions hereof or its duties hereunder, and it shall incur no liability and shall be fully protected in acting in accordance with the reasonable opinion or instructions of such
counsel.

Each of the Escrow Agent and the Transfer Agent shall not be responsible, may conclusively rely upon and shall be protected,
indemnified and held harmless by the Company, for the sufficiency or accuracy of the form of, or the execution, validity, value or genuineness of any document or property received, held or delivered by it hereunder, or of the signature or
endorsement thereon, or for any description therein; nor shall the Escrow Agent or the Transfer Agent be responsible or liable in any respect on account of the identity, authority or rights of the persons executing or delivering or purporting to
execute or deliver any document, property or this Agreement.

In the event that either the Escrow Agent or the Transfer Agent shall become
involved in any arbitration or litigation relating to the funds in the Escrow Account, each is authorized to comply with any decision reached through such arbitration or litigation.

The Company, hereby agrees to indemnify both the Escrow Agent and the Transfer Agent for, and to hold it harmless against any loss, liability or expense
incurred in connection herewith without gross negligence, recklessness or willful misconduct on the part of either of the Escrow Agent or the Transfer Agent, including without limitation legal or other fees arising out of or in connection with its
entering into this Agreement and carrying out its duties hereunder, including without limitation the costs and expenses of defending itself against any claim of liability in the premises or any action for interpleader. Neither the Escrow Agent, nor
the Transfer Agent, shall be under any obligation to institute or defend any action, suit, or legal proceeding in connection herewith, unless first indemnified and held harmless to its satisfaction in accordance with the foregoing, except that
neither shall be indemnified against any loss, liability or expense arising out of its own gross negligence, recklessness or willful misconduct. Such indemnity shall survive the termination or discharge of this Agreement or resignation of the Escrow
Agent.

7. The Escrow Agents Fee. Escrow Agent shall be entitled to fees and expenses for its regular services as Escrow Agent as
set forth in Exhibit A. Additionally, Escrow Agent is entitled to reasonable fees for extraordinary services and reimbursement of any reasonable out of pocket and extraordinary costs and expenses related to its obligations as Escrow Agent
under this Agreement, including, but not limited to, reasonable attorneys fees. All of the Escrow Agents compensation, costs and expenses shall be paid by the Company.

8. Security Interests. No party to this Escrow Agreement shall grant a security interest in any monies or other property deposited with the Escrow
Agent under this Escrow Agreement, or otherwise create a lien, encumbrance or other claim against such monies or borrow against the same.



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9. Dispute. In the event of any disagreement between the undersigned or the person or persons named
in instructions given pursuant to this Agreement, or any other person, resulting in adverse claims and demands being made in connection with or for any papers, money or property involved herein, or affected hereby, the Escrow Agent shall be entitled
to refuse to comply with any demand or claim, as long as such disagreement shall continue, and in so refusing to make any delivery or other disposition of any money, papers or property involved or affected hereby, the Escrow Agent shall not be or
become liable to the undersigned or to any person named in such instructions for its refusal to comply with such conflicting or adverse demands, and the Escrow Agent shall be entitled to refuse and refrain to act until: (a) The rights of the
adverse claimants shall have been fully and finally adjudicated in a court of competent jurisdiction over the parties and money, papers and property involved herein or affected hereby, or (b) All differences shall have been adjusted by
agreement and the Escrow Agent shall have been notified thereof in writing, signed by all the interested parties.

10. Resignation of
Escrow Agent. Escrow Agent may resign or be removed, at any time, for any reason, by written notice of its resignation or removal to the proper parties at their respective addresses as set forth herein, at least 60 days before the date specified
for such resignation or removal to take effect; upon the effective date of such resignation or removal:

(a) All cash and other
payments and all other property then held by the Escrow Agent hereunder shall be delivered by it to such successor escrow agent as may be designated in writing by the Company, whereupon the Escrow Agents obligations hereunder shall cease and
terminate; or

(b) If no such successor escrow agent has been designated by such date, all obligations of the Escrow Agent
hereunder shall, nevertheless, cease and terminate, and the Escrow Agents sole responsibility thereafter shall be to keep all property then held by it and to deliver the same to a person designated in writing by the Company or in accordance
with the directions of a final order or judgment of a court of competent jurisdiction; and

(c) Further, if no such successor
escrow agent has been designated by such date, the Escrow Agent may petition any court of competent jurisdiction for the appointment of a successor agent; further the Escrow Agent may pay into such court all monies and property deposited with Escrow
Agent under this Agreement.

11. Notices. All notices, demands and requests required or permitted to be given under the provisions
hereof must be in writing and shall be deemed to have been sufficiently given, upon receipt, if (i) personally delivered, (ii) sent by telecopy and confirmed by phone or (iii) mailed by registered or certified mail, with return
receipt requested, or by overnight courier with signature required, delivered to the addresses set forth below, or to such other address as a party shall have designated by notice in writing to the other parties in the manner provided by this
paragraph:



|                   |  |                                                            
|------------------ |  | -----------------------------------------------------------
|(1) If to Company: |  | Wells Core Office Income REIT, Inc.                        
|                   |  | 6200 The Corners Parkway, Suite 250
Norcross, Georgia 30092
|                   |  | Telephone: 770-449-7800                                    
|                   |  | Fax: 770-243-8286                                          



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|                            |  |                                                                                                                
|--------------------------- |  | ---------------------------------------------------------------------------------------------------------------
|                            |  | Company Wire Instructions:                                                                                     
|                            |  | To be provided by the Company                                                                                  
|                            | 
|(2) If to the Escrow Agent: |  | UMB Bank, N.A.                                                                                                 
|                            |  | 1010 Grand Blvd., 4th Floor                                                                                    
|                            |  | Mail Stop: 1020409                                                                                             
|                            |  | Kansas City, Missouri 64106                                                                                    
|                            |  | Attention: Lara Stevens,                                                                                       
|                            |  | Corporate Trust                                                                                                
|                            |  | Telephone: (816) 860-3017                                                                                      
|                            |  | Facsimile: (816) 860-3029                                                                                      
|                            | 
|                            |  | Escrow Agent Wiring Instructions:                                                                              
|                            |  | UMB Bank, N.A.                                                                                                 
|                            |  | ABA Routing Number: 101000695                                                                                  
|                            |  | Account Number: To be provided by UMB Bank, N.A.                                                               
|                            |  | Account Name: UMB Bank, N.A., as Escrow Agent for Wells Core Office Income REIT, Inc.                          
|                            | 
|                            |  | Checks Payable Information:                                                                                    
|                            |  | UMB Bank, N.A., as Escrow Agent for Wells Core Office Income REIT, Inc.                                        
|                            |  | Attention: Lara Stevens, Corporate Trust
1010 Grand Boulevard,
4thFloor
M/S 1020409 Kansas City, Missouri
64106
|                            | 
|(3) If to Dealer Manager:   |  | Wells Investment Securities, Inc.                                                                              
|                            |  | 6200 The Corners Parkway                                                                                       
|                            |  | Norcross, Georgia 30092                                                                                        
|                            | 
|                            |  | Telephone: 770-449-7800                                                                                        
|                            |  | Fax: 770-243-8286                                                                                              

12. Governing Law. This Agreement
shall be construed and enforced in accordance with the laws of the State of Missouri without regard to the principles of conflicts of law.

13. Binding Effect; Benefit. This Agreement shall be binding upon and inure to the benefit of the permitted successors and assigns of the parties
hereto.

14. Modification. This Agreement may be amended, modified or terminated at any time by a writing executed by the Dealer
Manager, the Company and the Escrow Agent.

15. Assignability. This Agreement shall not be assigned by the Escrow Agent without the
Companys prior written consent.



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16. Counterparts. This Agreement may be executed in one or more counterparts, each of which will be
deemed an original, but all of which together will constitute one and the same instrument. Copies, telecopies, facsimiles, electronic files and other reproductions of original executed documents shall be deemed to be authentic and valid counterparts
of such original documents for all purposes, including the filing of any claim, action or suit in the appropriate court of law.

17.
Headings. The section headings contained in this Agreement are inserted for convenience only, and shall not affect in any way, the meaning or interpretation of this Agreement.

18. Severability. This Agreement constitutes the entire agreement among the parties and supersedes all prior and contemporaneous agreements and
undertakings of the parties in connection herewith. No failure or delay of the Escrow Agent in exercising any right, power or remedy may be, or may be deemed to be, a waiver thereof; nor may any single or partial exercise of any right, power or
remedy preclude any other or further exercise of any right, power or remedy. In the event that any one or more of the provisions contained in this Agreement, shall, for any reason, be held to be invalid, illegal or unenforceable in any respect, then
to the maximum extent permitted by law, such invalidity, illegality or unenforceability shall not affect any other provision of this Agreement.

19. Earnings Allocation; Tax Matters; Patriot Act Compliance; OFAC Search Duties. The Company or its agent shall be responsible for all tax
reporting under this Escrow Agreement. The Company shall provide to Escrow Agent upon the execution of this Agreement any documentation requested and any information reasonably requested by the Escrow Agent to comply with the USA Patriot Act of
2001, as amended from time to time. The Escrow Agent, or its agent, shall complete an OFAC search, in compliance with its policy and procedures, of each Payment Instrument and shall inform the Company if a Payment Instrument fails the OFAC search.

20. Miscellaneous. This Agreement shall not be construed against the party preparing it, and shall be construed without regard to the
identity of the person who drafted it or the party who caused it to be drafted and shall be construed as if all parties had jointly prepared this Agreement and it shall be deemed their joint work product, and each and every provision of this
Agreement shall be construed as though all of the parties hereto participated equally in the drafting hereof; and any uncertainty or ambiguity shall not be interpreted against any one party. As a result of the foregoing, any rule of construction
that a document is to be construed against the drafting party shall not be applicable.

21. Third Party Beneficiaries. The Transfer
Agent shall be a third party beneficiary under this Agreement, entitled to enforce any rights, duties or obligations owed to it under this Agreement notwithstanding the terms of any other agreements between the Transfer Agent and any Party hereto.

22. Termination of the Escrow Agreement. This Agreement, except for Sections 6 and 10 hereof, which shall continue in effect, shall
terminate upon written notice from the Company to the Escrow Agent. Unless otherwise provided, final termination of this Agreement shall occur on the date that all funds held in the Escrow Account are distributed either (a) to the Company or to
subscribers and the Company has informed the Escrow Agent in writing to close the Escrow Account or (b) to a successor escrow agent upon written instructions from the Company.



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23. Relationship of Parties. The Dealer Manager and the Company are unaffiliated with the Escrow
Agent, and this Agreement does not create any partnership or joint venture among either the Dealer Manager or the Company and the Escrow Agent.

[SIGNATURE PAGES FOLLOW]



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IN WITNESS WHEREOF, the undersigned have caused this Agreement to be executed by
their duly authorized representatives as of the date first written hereinabove:



DEALER MANAGER: 
WELLS INVESTMENT SECURITIES, INC.By:

/s/ John E. MonroeName: Title:

John E. Monroe Assistant
TreasurerCOMPANY: 
WELLS CORE OFFICE INCOME REIT, INC.By:

/s/ Douglas P. WilliamsName: Title:

Douglas P. Williams
Executive Vice PresidentESCROW AGENT: 
UMB BANK, N.A.By:

/s/ Lara L. StevensName: Title:

Lara L. Stevens Vice
President




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Exhibit 4.5

EXHIBIT A

ESCROW FEES AND EXPENSES



|                                                |  |   |       |   
|----------------------------------------------- |  | - | ----- | --
|Acceptance Fee                                  |  |   |       |   
|Review escrow agreement and establish account   |  | $ | 3,000 |   
|Annual Fee                                      |  |   |       |   
|Maintain account                                |  | $ | 3,000 |   
|Transaction Fees                                |  |   |       |   
|(a) per outgoing wire transfer                  |  | $ | 35.00 |   
|(b) per Form 1099 (Int., B or Misc.)            |  | $ | 10.00 | * 
|(c) per investment purchase, sale or settlement |  | $ | 35.00 | **



|* | Not anticipated to be charged
|- | -----------------------------

|** | Excludes money market mutual fund transactions
|-- | ----------------------------------------------

Fees specified are for the regular, routine services contemplated by the Escrow Agreement, and any additional or extraordinary services, including, but
not limited to disbursements involving a dispute or arbitration, or administration while a dispute, controversy or adverse claim is in existence, will be charged based upon time required at the then standard hourly rate. In addition to the specified
fees, all expenses related to the administration of the Escrow Agreement (other than normal overhead expenses of the regular staff) such as, but not limited to, travel, postage, shipping, courier, telephone, facsimile, supplies, legal fees,
accounting fees, etc., will be reimbursable. Acceptance and first year annual fees will be payable at the initiation of the escrow and annual fees will be payable in advance thereafter. Other fees and expenses will be billed as incurred.



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Exhibit 4.5

EXHIBIT B

Form of Subscriber List

Pursuant to the Escrow Agreement dated as of _________ ___, 2010, by and among Wells Core Office Income REIT, Inc. (the Company), UMB
Bank, N.A., as escrow agent (the Escrow Agent), and Wells Investment Securities, Inc. (the Dealer Manager), the Dealer Manager hereby notifies the Escrow Agent that, as of the date set forth below, the following
Subscribers have submitted subscription funds for the purchase of shares of common stock of the Company (the Shares), such subscription funds have been deposited with Escrow Agent in accordance with the Escrow Agreement:



|      |  |                                                     
|----- |  | ----------------------------------------------------
|1.    |  | Name of Subscriber                                  
|      |  | Address                                             
|      |  | Tax Identification Number                           
|      |  | Number of Shares subscribed for                     
|      |  | Amount of money paid and deposited with Escrow Agent
|      | 
|2.    |  | Name of Subscriber                                  
|      |  | Address                                             
|      |  | Tax Identification Number                           
|      |  | Number of Shares subscribed for                     
|      |  | Amount of money paid and deposited with Escrow Agent
|      | 
|. . . |  | Name of Subscriber                                  
|      |  | Address                                             
|      |  | Tax Identification Number                           
|      |  | Number of Shares subscribed for                     
|      |  | Amount of money paid and deposited with Escrow Agent



_____________________By:Name:Title:Date:



, 2010




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