UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington D.C. 20549

FORM 10-D

ASSET BACKED ISSUER
DISTRIBUTION REPORT PURSUANT TO SECTION 13 OR 15(d) OF
THE SECURITIES EXCHANGE ACT OF 1934

For the monthly distribution period from: ~~November~~December 1413, 2024 to ~~December~~January 1210, ~~2024~~2025

Commission File Number of issuing entity: 333-193376-14

Central Index Key Number of issuing entity: 0001625426

COMM 2014-CCRE21 Mortgage Trust
(Exact name of issuing entity as specified in its charter)

Commission File Number of depositor: 333-193376

Central Index Key Number of depositor: 0001013454

Deutsche Mortgage & Asset Receiving Corporation
(Exact name of depositor as specified in its charter)

Central Index Key Number of sponsor (if applicable): 0001541294

German American Capital Corporation
(Exact name of sponsor as specified in its charter)

Central Index Key Number of sponsor (if applicable): 0001089877

KeyBank National Association
(Exact name of sponsor as specified in its charter)

Central Index Key Number of sponsor (if applicable): 0001541886

UBS Real Estate Securities Inc.
(Exact name of sponsor as specified in its charter)

Central Index Key Number of sponsor (if applicable): 0001558761

Cantor Commercial Real Estate Lending, L.P.
(Exact name of sponsor as specified in its charter)

Central Index Key Number of sponsor (if applicable): 0001542256

Natixis Real Estate Capital LLC
(Exact name of sponsor as specified in its charter)

Central Index Key Number of sponsor (if applicable): 0001625508

Pillar Funding LLC
(Exact name of sponsor as specified in its charter)

Lainie Kaye (212) 250-2500
(Name and telephone number, including area code, of the person to contact in connection with this filing)

New York
(State or other jurisdiction of incorporation or organization of the issuing entity)

38-3952005
38-3952006
38-7127874
(I.R.S. Employer Identification No.)

c/o Computershare Trust Company, N.A., as agent for
Wells Fargo Bank, National Association
9062 Old Annapolis Road
Columbia, MD 21045
(Address of principal executive offices of the issuing entity) (Zip Code)

(667) 786-1992
(Telephone number, including area code)

Not Applicable
(Former name, former address, if changed since last report)

Registered/reporting pursuant to (check one)

Title of Class	Section 12(b)	Section 12(g)	Section 15(d)	Name of Exchange (If Section 12(b))
A-1			X
A-2			X
A-SB			X
A-3			X
A-M			X
B			X
PEZ			X
C			X
X-A			X

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days. Yes X No

Part I - DISTRIBUTION INFORMATION

Item 1. Distribution and Pool Performance Information.

On ~~December~~January 1210, ~~2024~~2025 a distribution was made to holders of the certificates issued by COMM 2014-CCRE21 Mortgage Trust.

The distribution report is attached as an Exhibit to this Form 10-D, please see Item 10(b), Exhibit 99.1 for the related information.

The following table presents the loss information for the trust assets for the COMM 2014-CCRE21 Mortgage Trust in accordance with Item 1100(b) as required by Item 1121(a)(9) of Regulation AB:

Loss Information as reported on DecemberJanuary 1210, 20242025

Number of Delinquencies 30+ days	% of Delinquencies 30+ days by Pool Balance	Number of Loans/REOs with Losses	Average Net Loss
3	4372.1726%	4	$4,682,311.72

No assets securitized by Deutsche Mortgage & Asset Receiving Corporation (the "Depositor") and held by COMM 2014-CCRE21 Mortgage Trust were the subject of a demand to repurchase for breach of the representations and warranties contained in the underlying transaction documents during the distribution period from ~~November~~December 1413, 2024 to ~~December~~January 1210, ~~2024~~2025.

The Depositor filed its most recent Form ABS-15G in accordance with Rule 15Ga-1 under the Securities Exchange Act of 1934 (a "Rule 15Ga-1 Form ABS-15G") on February 12, 2024. The CIK number for the Depositor is 0001013454.

German American Capital Corporation ("GACC"), one of the sponsors, has filed a Form ABS-15G pursuant to Rule 15Ga-1 under the Securities Exchange Act of 1934 on February 12, 2024. The CIK number of GACC is 0001541294.

KeyBank National Association ("KeyBank"), one of the sponsors, has filed a Form ABS-15G pursuant to Rule 15Ga-1 under the Securities Exchange Act of 1934 on February 1, 2024. The CIK number of KeyBank is 0001089877.

UBS Real Estate Securities Inc. ("UBS"), one of the sponsors, has filed a Form ABS-15G pursuant to Rule 15Ga-1 under the Securities Exchange Act of 1934 on February 6, 2024. The CIK number of UBS is 0001541886.

Cantor Commercial Real Estate Lending, L.P. ("CCREL"), one of ~~the~~ the sponsors, has filed a Form ABS-15G pursuant to Rule 15Ga-1 under the ~~Securities~~ Securities Exchange Act of 1934 on October 31, 2024. The CIK number of CCREL is 0001558761.

Natixis Real Estate Capital LLC ("NREC"), one of the sponsors and mortgage loan sellers, most recently filed a ~~Form~~ Form ABS-15G pursuant to Rule 15Ga-1 under the Securities Exchange Act of 1934 on February 14, 2024. The CIK number of NREC is 0001542256.

Pillar Funding LLC ("Pillar"), one of the sponsors, has filed a Form ABS-15G pursuant to Rule 15Ga-1 under the Securities Exchange Act of 1934 on January 29, 2019. The CIK number of Pillar is 0001625508.

Part II - OTHER INFORMATION

Item 102. ~~Exhibits~~Legal Proceedings.

~~(a)~~Disclosure ~~The~~from ~~following~~CWCapital isAsset aManagement ~~list~~LLC, ~~of documents filed~~ as ~~part of this Report on~~ ~~Form~~special ~~10-D~~servicer:

From time to time, CWCapital Asset Management LLC, a Delaware limited liability company (~~99.1~~“CWCAM”), is ~~Monthly~~a ~~report~~party ~~distributed~~ to lawsuits and other legal proceedings as part of its duties as a ~~holders~~special servicer (e.g., enforcement of loan obligations) and/or arising in the ordinary ~~certificates~~course ~~issued~~of bybusiness. ~~COMM~~Other ~~2014-CCRE21~~than as set forth in the following ~~Mortgage~~paragraphs, ~~Trust~~there are currently no legal proceedings pending, ~~relating~~and no legal proceedings known to ~~the~~be ~~December~~contemplated 12by governmental authorities, ~~2024 distribution.~~against CWCAM or of which any of its property is the subject, that are material to the certificateholders.

On December 17, 2015, U.S. Bank National Association, the trustee under five pooling and servicing agreements for (bi) Wachovia Bank Commercial Mortgage Trust 2007-C30, (ii) COBALT CMBS Commercial Trust 2007-C2, (iii) Wachovia Bank Commercial Mortgage Trust 2007-C31, (iv) ML-CFC Commercial Mortgage Trust 2007-5 and (v) ML-CFC Commercial Mortgage Trust 2007-6 commenced a proceeding with the Second Judicial District Court of Ramsey County, Minnesota (the “State Court”) for a declaratory judgment as to the proper allocation of certain proceeds (“Disputed Proceeds”) received by CWCAM in connection with the sale of the Peter Cooper Village and Stuyvesant Town property in New York, New York securing loans held by those trusts. CWCAM was the special servicer of such property. The ~~exhibits~~petition ~~required~~requests the State Court to beinstruct the trustee, the trust beneficiaries, and any other interested parties as to the amount of the Disputed Proceeds, if any, that constitute penalty interest and/or the amount of the Disputed Proceeds, if any, that constitute gain-on-sale proceeds, with respect to each trust. On February 24, 2016, CWCAM made a limited appearance with the State Court to file a motion to dismiss this proceeding based on lack of jurisdiction, mootness, standing and forum non conveniens. On July 19, 2016, the State Court denied CWCAM’s motion to dismiss. On July 22, 2016, the action was removed to federal court in Minnesota (“Federal Court”). On October 21, 2016, the Federal Court held a hearing on the motion to transfer the action to the United States District Court for the Southern District of New York (“SDNY Court”), a motion to remand to state court and a motion to hear CWCAM’s request for reconsideration of the motion to dismiss. On March 14, 2017, the Federal Court reserved the determination on the motion to hear CWCAM’s request for reconsideration of the motion to dismiss, denied the motion to remand the matter to state court and granted the motion to transfer the proceeding to the SDNY Court. Cross motions for judgment on the pleadings were filed but the SDNY Court was unable to decide the case based on the pleadings and the SDNY Court ordered discovery. All fact discovery was completed in December, 2018 and expert discovery was completed on March 15, 2019. The parties submitted cross motions for summary judgment, and on March 19, 2020, the SDNY Court entered an opinion and order in which it granted summary judgment in CWCAM’s favor and held that CWCAM was entitled to the entire amount of penalty interest and that CWCAM’s determination of Yield Maintenance was correct. In the 127-page opinion, the SDNY Court found for CWCAM on every issue presented by the trustee’s petition, namely, that the ~~Registrant~~funds ~~pursuant~~in dispute constitute penalty interest and yield maintenance, not gain-on-sale proceeds, and that the amount of penalty interest and yield maintenance was correctly calculated. An appeal of the SDNY Court’s decision was taken on April 29, 2020. Oral argument on the appeal occurred on June 21, 2021. On July 14, 2022, the Second Circuit entered a decision affirming in part and reversing in part the SDNY Court’s decision and remanding to ~~this~~the SDNY Court for further proceedings. ~~Form~~The Second Circuit affirmed the SDNY’s Court holding that Penalty Interest and Yield Maintenance are ~~listed~~paid ~~above~~before Gain-On-Sale Proceeds. The Second Circuit reversed and remanded for further proceedings that portion of the SDNY Court’s decision related to approximately $67.2 million in interest on advances. On January 13, 2023, the parties entered into a settlement agreement, in which (among other things) they agreed to stipulate that the amount of Interest on advances that accrued on or before June 3, 2014 is $27.5 million, and that CWCAM would pay that amount into escrow for distribution to certificateholders upon the entry of an order by the Court approving the settlement. U.S. Bank National Association, as Trustee for the trusts, provided notice of the settlement to all parties in interest via a notice program approved by the Court. A hearing on the settlement was scheduled for March 16, 2023 and was continued to May 5, 2023. The court approved the settlement in a decision dated April 8, 2024. An appeal of the Court’s decision was filed by one party, Cobalt LLC, which is believed to be focused solely on the timing of the distribution of the $27.5 million and not with respect to CWCAM’s liability or the amount paid. The appeal brief is due on September 1, 2024. The matter was subsequently resolved by the parties and approved by the Court and no further proceedings are required. The matter is closed.

~~SIGNATURES~~On December 1, 2017, a complaint against CWCAM and others was filed in the United States District Court for the Southern District of New York styled as CWCapital Cobalt Vr Ltd. v. CWCapital Investments LLC, et al., No. 17-cv-9463 (the “Original Complaint”). The gravamen of the Original Complaint alleged breaches of a contract and fiduciary duties by CWCAM’s affiliate, CWCapital Investments LLC in its capacity as collateral manager for the collateralized debt obligation transaction involving CWCapital Cobalt Vr, Ltd. In total, there are 14 counts pled in the Original Complaint. Of those 14, 5 claims were asserted against CWCAM for aiding and abetting breach of fiduciary duty, conversion and unjust enrichment. On May 23, 2018, the Original Complaint was dismissed for lack of subject matter jurisdiction. On June 28, 2018, CWCapital Cobalt Vr Ltd. filed a substantially similar complaint in the Supreme Court of the State of New York, County of New York styled as CWCapital Cobalt Vr Ltd. v. CWCapital Investments LLC, et al., Index No. 653277/2018 (the “New Complaint”). The gravamen of the New Complaint is the same as the previous complaint filed in the United State District Court for the Southern District of New York. In total there are 16 counts pled in the New Complaint. Of those 16 counts, 5 claims were asserted against CWCAM for aiding and abetting breach of fiduciary duty, conversion and unjust enrichment, 1 count seeks a declaratory judgement that the plaintiff has the right to enforce the contracts in question and 1 count seeks an injunction requiring the defendants to recognize the plaintiff as the directing holder for the trusts in question. On January 11, 2019, the plaintiff dismissed with prejudice the declaratory judgment and injunction counts. The New Complaint and related summons was not served on the defendants until July 13, 2018 and July 16, 2018. The plaintiff’s motion for a preliminary injunction was denied by the court on July 31, 2018. On August 3, 2018, the defendants, including CWCAM, filed a motion to dismiss the New Complaint in its entirety. On August 20, 2019, the court entered an order granting defendants’ motion almost in its entirety, dismissing 11 of the 16 counts and partially dismissing 2 additional counts. Of the remaining counts, 2 are asserted against CWCAM for aiding and abetting breach of fiduciary duty and unjust enrichment. On September 19, 2019, CWCapital Cobalt Vr Ltd. filed a notice of appeal relating to the August 20, 2019 dismissal order and on September 26, 2019, filed an amended complaint against CWCI and CWCAM attempting to address deficiencies relating to certain of the claims dismissed by the August, 20, 2019 order. CWCI and CWCAM filed its Motion to Dismiss the amended complaint on October 28, 2019. The court heard argument on the Motion to Dismiss the amended complaint on January 22, 2020 and on October 23, 2020, the court granted the motion dismissing the amended claims. On November 30, 2020, CWCapital Cobalt Vr Ltd filed a notice of appeal relating to the October 23, 2020 dismissal order. On April 27, 2021, the First Department affirmed the dismissal as to claims against CWCAM that were part of the August 20, 2019 dismissal, but reversed the dismissal of two counts for breach of the Collateral Management Agreement against CWCI. CWCI sought leave to file an appeal of the decision. The plaintiff also sought leave to appeal the dismissal of the claims against CWCAM. Both requests for leave were denied by the First Department. On May 15, 2020, CWCI and CWCAM filed a motion to renew its motion to dismiss as to 4 of the remaining counts (including the remaining two counts against CWCAM for aiding and abetting breach of fiduciary duty and unjust enrichment), based on a decision entered by Judge Failla in a trust instruction proceeding in the US District Court for the Southern District of New York awarding summary judgment in favor of CWCAM. On September 7, 2021, the court denied the motion to renew. CWCI and CWCAM filed a notice of appeal, which they perfected by the filing of their opening brief on July 1, 2022. On November 15, 2022, the First Department affirmed the court’s denial of the motion to renew. On October 1, 2021, CWCI and CWCAM moved to reargue the denial of the motion to renew (or alternatively, the motion to dismiss) with respect to certain of Cobalt’s claims, including the remaining 2 claims against CWCAM, based on the First Department’s April 27, 2021 decision. On March 24, 2022, the court denied the relief sought in the motion to reargue. CWCI and CWCAM appealed the court’s decision on the motion to reargue and filed their opening brief on July 11, 2022. The appeal was dismissed as being non-appealable on August 30, 2022. Discovery (both fact and expert) concluded on March 1, 2024. CWCAM and CWCI filed a motion for summary judgment on March 29, 2024, seeking dismissal of all the claims in their entirety. On that same date, the plaintiff cross moved for summary judgment on one of the claims asserted against only CWCI. Summary judgment briefing is scheduled to conclude on June 18, 2024. Oral argument was heard on October 22, 2024 and the court has taken the arguments under consideration. The timing of a decision is unknown. CWCAM believes that it has performed its obligations under the related pooling and servicing agreements in good faith and the remaining allegations in the New Complaint are without merit.

~~Pursuant~~Item to10. ~~the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized~~Exhibits.

~~Deutsche~~(a) ~~Mortgage~~The &following ~~Asset~~is ~~Receiving~~a ~~Corporation~~list of documents filed as part of this Report on ~~(Depositor)~~Form 10-D:

~~/s/~~(99.1) ~~Matt~~Monthly ~~Smith~~report distributed to ~~Matt~~holders ~~Smith~~of the certificates issued by COMM 2014-CCRE21 Mortgage Trust, ~~Director~~relating to the January 10, 2025 distribution.

~~Date: December~~(b) ~~26,~~The ~~2024~~exhibits required to be filed by the Registrant pursuant to this Form are listed above.

~~/s/ R. Chris Jones R. Chris Jones, Managing Director~~SIGNATURES

~~Date: December~~Pursuant 26to the requirements of the Securities Exchange Act of 1934, ~~2024~~the registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.

Deutsche Mortgage & Asset Receiving Corporation
(Depositor)

/s/ Matt Smith
Matt Smith, Director

Date: January 22, 2025

/s/ R. Chris Jones
R. Chris Jones, Managing Director

Filing Compare · COMM 2014-CCRE21 Mortgage Trust