Company: KBSR
Filing Date: 2025-04-28
Form Type: DEFA14A
Source: 0001482430-25-000027
Chunk: 0

Company: KBS Real Estate Investment Trust III, Inc.
Filing Date: 2025-04-28
Form: DEFA14A
Chunk 0
---
### UNITED STATES

### SECURITIES AND EXCHANGE COMMISSION

#### WASHINGTON, DC 20549

#### SCHEDULE 14A

#### Proxy Statement Pursuant to Section 14(a) of the

#### Securities Exchange Act of 1934
Filed by the Registrant ☒

Filed by a Party other than the Registrant ☐

Check the appropriate box:

☐ Preliminary Proxy Statement

☐ Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2))

☐ Definitive Proxy Statement

☒ Definitive Additional Materials

☐ Soliciting Material Pursuant to § 240.14a-12

#### KBS REAL ESTATE INVESTMENT TRUST III, INC.
<div align='center'>(Name of Registrant as Specified in its Charter)</div>

Payment of Filing Fee (Check the appropriate box):

☒ No fee required.

☐ Fee paid previously with preliminary materials.

☐ Fee computed on table in exhibit required by Item 25(b) per Exchange Act Rules 14a-6(i)(1) and 0-11.

|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |     |                            |     | YourVoteCounts!                            |     |                          |     |                                |
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |     |                            |     | KBS REAL ESTATE INVESTMENT TRUST III, INC. |     |                          |     |                                |
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |     |                            |     | 2025 Annual Meeting                        |     |                          |     |                                |
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |     |                            |     | Vote by July 22, 2025                      
 11:59 PM ET                                |     |                          |     |                                |
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |     | C/O DST SYSTEMS, INC.      
 P.O. BOX 219015            
 KANSAS CITY, MO 64121      |     |                                            |     |                          |     |                                |
| You invested in KBS REAL ESTATE INVESTMENT TRUST III, INC. and it's time to                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         
 vote!                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |     |                            |     |                                            |     |                          |     |                                |
| You have the right to vote on proposals being presented at the Annual Meeting.This is an important notice regarding the                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             
 availability of proxy materials for the stockholder meeting to be