John Edward Brennock

John Edward Brennock

5.0
Rating: 8.6

Licensed for 16 years

Real estate Lawyer at Naperville, IL
Practice Areas: Real Estate, Probate, Estate Planning ... +5 more

1771 West Diehl Road, Suite 120, Naperville, IL

About John

Biography

Practice Areas

8

Practice Areas

Probate 30%

Contested Estates, Estate Litigation and Guardianship

16 years

30%
Real Estate 30%

16 years

30%
Landlord or Tenant 15%

Lease negotiation and eviction litigation.

16 years

15%
Business 5%

16 years

5%
Appeals 1%

11 years

1%
Elder Law 1%

11 years

1%

Fees and Rates

Cost

Free Consultation

$0 first 6 minutes

Hourly Rates

$ 175-375 per hour


Payment Methods

  • Cash
  • Check

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Licenses

Licensed in Illinois for 16 years

State: Illinois

Acquired: 2009

Active and Authorized to Practice Law

No misconduct found

Location

Diaz Anselmo & Associates P.A.

1771 West Diehl Road, Suite 120, Naperville, IL, 60563

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John Edward Brennock's Reviews

Avvo Review Score

5.0 /5.0

72 Client Reviews

5 star (71) 4 star (1)
3 star (0)
2 star (0)
1 star (0)

Posted by Anthony | September 10, 2025 | Consulted Attorney

This review is from a potential client who consulted with this attorney.

John Brennock is the only attorney I will ever use for an real-estate related issue

I have been working with John Brennock and his staff for 5 years for the purchases of 2 commercial multi-unit properties in Wicker Park, as well as a 3-flat in Wrigleyville. I have trusted all my closings with him, as well as an easement issue I had with a neighbor. He walked me through several pos...t-closing issues, provided guidance, and helped me with rational and profitable thinking during stressful times. He personally called me when he noticed a tax issue and saved me thousands in taxes. His rates are great, and I will continue to work with him as I grow my portfolio. I cannot recommend this great group enough. Thank you John!!!

Posted by anonymous | September 6, 2025 | Hired Attorney

This review is from a person who hired this attorney.

Great!

Super helpful. Prompt. Answered all of my questions. Even on a friday night!

Posted by Ken | August 31, 2025 | Hired Attorney

This review is from a person who hired this attorney.

John Is Da Man

John was my attorney for my purchase of a multi-unit building. John was very responsive to my questions, gave me great advice, and solved problems that came up due to inspections / appraisals and an international seller. I recommend John to anyone looking for an excellent real estate attorney.

Posted by Jeanette | August 31, 2025 | Hired Attorney

This review is from a person who hired this attorney.

When you need an expert in real estate & family law, John Brennock DELIVERS!

I was lucky enough to be referred to John Brennock when I was looking for an attorney to handle my real estate purchase. From our first phone consultation through the inspection, the attorney review, the closing itself, and concerns after the closing, John's professionalism, courtesy, good humor ...and expertise gave me the confidence I truly needed to get through this rather daunting process. I would recommend John Brennock to anyone in need of a real estate attorney. If you want (or NEED), peace of mind to get you through the pitfalls of buying a home safely, you cannot do better than this wonderful man and his staff! It was obvious from the start that John insists on excellence from his entire team. They were very quick to respond to any concern and kept me informed every step of the way in a very friendly and positive way. No question or concern was too small or inconsequential. I wish all customer service experiences were this good! From the wrong PIN Number for the taxes at the property I was buying to discovering an unresolved lien against the property at the closing, John dealt with all of it and made sure I had no cause to worry. He explained what was going on & what I needed to do. He asked what I wanted and did his best to make it happen. I felt that my interests were well looked after, and they really were! I plan to continue to use John as my attorney for my will as well. You cannot go wrong by choosing John to represent you. Having him fight your corner is guaranteed to make your life easier. Once you speak with this very approachable and friendly man, you will feel that you made a good decision. He gives an overview of what to expect, understands how confusing things can get and he or his staff are always available to address any question or concern. He makes sure you're comfortable with how things are proceeding and when problems arise, they are immediately addressed. I cannot say enough good things about John! I'm sure you will feel the same way!

Posted by Shideh | July 11, 2025 | Hired Attorney

This review is from a person who hired this attorney.

Experienced and Reliable Attorney

I had an outstanding experience with Diaz Anselmo Law Firm while selling my house and buying my condo. Attorney John Brennock and paralegal Anne Baker were exceptional, ensuring a successful and seamless closing. I would not hesitate to work with them again and highly recommend their services for rea...l estate needs.

See All Client Reviews

John Edward Brennock's Lawyer Endorsements

Endorse John
Michelle K. Grayzeck headshot
Michelle Grayzeck

Unknown lawyer | Feb 12

Relationship: Fellow lawyer in community

"I endorse John. He is a passionate and zealous advocate for his clients and an absolute professional to work with."

Aaron E. Rifkind headshot
Aaron Rifkind

Landlord or tenant lawyer | Sep 23

Relationship: Opposing Counsel on matter

"I endorse this lawyer."

Joseph Andrew Brabender IV headshot
Joseph Brabender

Landlord or tenant lawyer | May 20

Relationship: Worked together on matter

"John and I have worked together on numerous landlord-tenant matters with excellent results."

Brad E. Karlin headshot
Brad Karlin

Unknown lawyer | Jun 02

Relationship: Fellow lawyer in community

"I endorse this lawyer."

Scott David Goldman headshot
Scott Goldman

Unknown lawyer | Apr 25

Relationship: Friend

"Mr. Brennock is an excellent attorney with an excellent track record. When it comes to representation in the greater Chicago area, you cannot go wrong using Mr. Brennock's exceptional services. Do not let your rights be handled by anyone else -- Mr. Brennock is the right stop for you."

Jeffrey Anthony Skiendziul headshot
Jeffrey Skiendziul

Landlord or tenant lawyer | Mar 21

Relationship: Fellow lawyer in community

"I find Mr. Brennock to be a highly reputable and reliable attorney who is knowledgeable, capable and compassionate towards his clients. Anyone needing legal advice should turn to John Brennock. I endorse this lawyer."

Jason Michael Perash headshot
Jason Perash

General practice lawyer | Feb 23

Relationship: Worked together on matter

"I endorse this lawyer. John tutored me years ago in law school, and he always had a thorough command of the various areas of law. We have talked often since then, and he has given me valuable advice on how to run my practice and help clients. If you live near Chicago and have a problem that John can help you with, I unquestionably recommend a call to John."

Howard M Lewis headshot
Howard Lewis

Landlord or tenant lawyer | Feb 23

Relationship: Fellow lawyer in community

"I endorse this lawyer. Attorney Brennock is an outstanding attorney with an excpeptional reputation. He is a strong and zealous advocate for his clients and a credit to the legal profession."

Stephanie Bowman Arsenty headshot
Stephanie Arsenty

Unknown lawyer | Feb 17

Relationship: Fellow lawyer in community

"I endorse this lawyer."

Edwin H. Korb headshot
Edwin Korb

Landlord or tenant lawyer | Mar 05

Relationship: Worked together on matter

"I endorse this lawyer. He is bright, knows the law well, has a great temperment yet is an excellent advocate for his clients. He has a strong work ethic and always quotes the most reasonable fees. I know he has many satisfied clients."

Carlton Richard Marcyan headshot
Carlton Marcyan

General practice lawyer | Mar 05

Relationship: Fellow lawyer in community

"J.E. Brennock is an aggressive, insightful and smart lawyer who provides valuable service and assistance to his clientele. Most importantly he is a person who can be trusted and zealously protects his client's interests. I strongly recommend him to be your counsel. Carlton R. Marcyan Attorney/CPA/CFP"

View All Endorsements
Jason Michael Perash headshot
Jason Perash

Unknown lawyer

Stephanie Bowman Arsenty headshot
Stephanie Arsenty

Foreclosure lawyer

Brad E. Karlin headshot
Brad Karlin

Litigation lawyer

Jeffrey Anthony Skiendziul headshot
Jeffrey Skiendziul

Criminal defense lawyer

Mark Aaron Silverman headshot
Mark Silverman

Landlord or tenant lawyer

Experience

Rating:  8.6 (Excellent)

Honors

2015

Client's Choice Award - Landlord & Tenant Law, Avvo

2014

Client's Choice Award - Landlord & Tenant Law, Avvo

2013

Client's Choice Award - Landlord & Tenant Law, Avvo

2012

Clients' Choice Award - Landlord & Tenant Law, Avvo

2008

The Eugene S. Quigley Delta Theta Phi Scholarship Award., Delta Theta Phi Law Fraternity, Power Senate

Work Experience

2023 - Present

Senior Associate Attorney, Diaz Anselmo & Associates P.A.

2021 - 2023

Associate Attorney, Diaz Anselmo & Associates P.A.

2020 - 2021

Principal, Law Offices of John E. Brennock

2019 - 2020

Associate Attorney, Spain, Spain & Varnet, PC

2015 - 2019

Senior Associate Attorney, Alicja M. Sroka & Associates, P.C.

2009 - 2015

Principal, Law Offices of John E. Brennock

2008 - 2008

Legal Intern, Glassen Rhead McLean Campbell & Schumacher

2008 - 2008

Student Attorney, Washtenaw Public Defender Clinic

Associations

2017 - Present

Illinois State Bar Association

Member - Judicial Evaluation Committee (Cook County)

2016 - Present

DuPage County Bar Association

Member

2016 - Present

Illinois State Bar Association

Member - Standing Committee on Delivery of Legal Services

2011 - Present

First American Title

Attorney Title Agent

2011 - Present

Chicago Title

Attorney Title Agent

2009 - Present

American Bar Association

Member

2009 - Present

Chicago Bar Association

Member

2009 - Present

Illinois State Bar Association

Member

Sample of Legal Cases

FirstMerit Bank, N.A. v. Soltys, 2015 IL App (1st) 140100

Appellate court affirmed dismissal of claims against Defendant/Client

Security Deposit Recovery Case

Settled - Tenant received $5,550.00

Security Deposit Recovery Case

Settled - Tenant received $4,314.50

See More Legal Cases

Education

2008

Western Michigan University

JD - Juris Doctor

2006

John Carroll University

BA - Bachelor of Arts

Speaking Engagements

2024

Landtrust Title Services - May 2024 presentation

Title 101 and 2024 Title Market Trends: What REALTORS Need to Know

2024

Chicago Veterans Real Estate Meetup - July 2024

Risk Mitigation, Protecting Your Interests and Getting the Deal Closed: Your Attorney's Role in the Real Estate Transaction

2019

The Chicago Friendly Lawyers Conference - 2019 Law Firm Buisness Plans (starting and growing your practice)

2017

ABA Law Student Division National Arbitration Competition - National Finals

Arbitration Competition - Judge

2015

Chicago Bar Association Moot Court Competition Competition Judge

2015

ABA Law Student Division National Arbitration Competition - National Finals Arbitration Competition - Judge

2014

ABA Law Student Division National Appellate Advocacy Competition

Moot Court - Appellate Judge

2014

7th Circuit Spring Meeting Lunch with Professionals (Landlord/Tenant)

Publications

Languages

English

Activity

Avvo Rating

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  • Experience & background Years licensed, work experience, education
  • Legal community recognition Peer endorsements, associations, awards
  • Legal thought leadership Publications, speaking engagements
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