Your Prestigious K Street Address Starts Here

Nice offices but I feel visitors should be ID checked.

— Uvais Mohammed

— Jp Perez

“OSI has been an integral part of our construction business over the past 5+ years. The team has always been responsive to our needs and we will continue to partner with them as extended members of the aztec construction LLC family."

— Aztec Construction Patrica Moore, President

Renting office space from O.S.I. Management, Inc. has been one of the best business decisions I have made. The location, professional atmosphere and range of services have been invaluable to my practice.

— Diane Kern

The staff is friendly and well managed! The space is nice enough, could be a bit larger but overall ok office spaces, large conference rooms very flexible and reasonable pricing.

— Morgan Stanley

Now this is the place you want to go to for all your professional needs. They have a limited controlled access, freedom to reserve rooms that will accommodate your needs for the day, and also detailed updates on package deliveries. OSI is walking distance from the White House, which is always a pleasure to see. Overall, this a wonderful place to call your office.

— Anthony Berry

As a clinical psychologist, I can say that OSI provides exactly what I need . They provide great locations, professional office suites, flexibility, dependability, good friendly professional service with individualized attention, and the best rates in Washington, DC. This is why I have been with them for over 20 years.”

— Marcus M. Mottley, Ph.D. Executive Coach & Organizational Consultant

"Started my therapy practice here, which ended up being perfect. The flexibility it provided for my hybrid set-up, during Covid too, was great. Staff is super friendly and helpful, location is great, and my clients always felt very welcome. Now moved on to having a full time office space down the street, but look back fondly at my time there"

— Tim van den Broek

Law Offices of David Saffold LLC has been a long time (18+ years) and loyal customer of OSI. The virtual office model was great while we were building the business and clientele. Once we outgrew the virtual office model we decided to rent a full time office on the 1629 K Street NW 3rd floor suite. The offices are well-maintained and cleaned daily with a professional cleaning service. The staff at the front desk make our clients feel welcome and are excellent at receiving and distributing mail as well as receiving documents and payments from clients. Finally, the location (Farragut Square) and amenities (high-speed printer/copier/internet) cannot be beat! Very satisfied, David Saffold

— Light Warrior 2.0

"I started my small business with OSI Offices, and they have been more than just an office space provider – they’ve been like a guardian to my business. From day one, their team has motivated and supported me in every aspect of my entrepreneurial journey. It’s not just about having an office; OSI offers invaluable in-house resources, including connections with experts in tax, finances, and company formation. The affordability of their services, especially for such a prestigious K Street location, is unmatched. Having my business office at this address has built trust with my clients, giving my business a level of professionalism and credibility that only OSI could provide. I see OSI and its employees as my partner in my business journey."

— Tareque Mehdi, Ph.D.

Staff are very professional. Space looks great

— Thomas Davis

It was great. I got all of my questions answered.

— Delbrea Kimble

Greetings to Mumbi and all OSI Management, Inc. personnel. For over 20 years, I have patronized the business for a variety of relevant services. Endless thanks for the outstanding customer service and support, professionalism, and constant efficacy. The management team and administrative staff are unrivaled!

— Dr. Manns

The staff is outstanding they far beyond what you would expect from a virtual office organization. DR R.D. Carter Jr

— Ralph Carter Jt

— C Hodges

"For more than two decades, Jack Pearce and OSI Inc. have provided excellent professional service to my firm, Lasley And Associates. With the assistance and professional service of OSI, I have been able to maintain a vibrant criminal law and civil rights practice. I have advanced several major civil and human rights initiatives – especially the Height-Mandel (Tambo) leadership institute for civil and humanitarian rights, and Houstonian jurisprudence. Thanks Jack."

— Michael Lasley Esq.

"I LOVE my office at OSI. I visited a few other places like Regus before I made my decision to go with OSI and I am so happy with my choice. Having the K Street address is priceless. The location is convenient for all my clients, easy to find and metro accessible. The staff on hand are friendly and helpful, especially Mumbi, the manager. I recommend OSI Offices to all of my fellow entrepreneurs."

— Kiki Strickland

“I have performed European and African international law, have had an office presence in the K Street Corridor since 1976, and have used OSI for over 15 years because it has provided by far my best experience."

— John Floyd III, Esq

— Claitt Family

I have used O.S.I Management Inc. services for several years from 2008 to 2010 and again since 2013 for my law office. I always have been very satisfied with the professionalism and responsiveness of the owner, Mr. Jack Pearce and his new manager, Ms. Mumbi Thande. O.S.I. has been flexible and accommodating to my business needs more than once. In 2013, when I re-established my practice, I would not have chosen to go any other place than to O.S.I. - I just called Mr. Pearce and an hour later, I was all set! Their prices are competitive, the team is always kind and available and I never experienced any glitch. A big thumb up for "Jack" and his team!

— Cécile Neuvens

Awesome group and very pleasant to work with. Best prices in D.C.

— Makeba Armstrong

OSI has been instrumental in growing my business from a few evening a week to a full time thriving practice. The front desk is approachable and helpful, always willing to help me when I need some administrative support. Mumbi, the office manager, is a joy. She has consistently been attentive to the needs of my practice and invested in helping me establish systems that keep my business working seamlessly. The variety of services OSI has offered me has been invaluable. The office suite is safe and secured at all times of the day, mail is delivered in a timely fashion, and my account is charged automatically on a monthly basis. Even when I am out of the office, I am notified when a package arrives for me. As a sole proprietor, I lack the luxury and assistance of an HR department, IT team, and an administrative specialist. Mumbi, Joseph, Jack, and the front desk have all stepped up at various times over the past two years to ensure I have an office space that works on behalf of me and the people I serve.

— Christina Moynihan

"Prompt and efficient service. Everything you need to start inning your business."

— Brittany Kerr

I LOVE my office at OSI. I visited a few other places like Regus before I made my decision to go with OSI and I am so happy with my choice. Having the K Street address is priceless. The location is convenient for all my clients, easy to find and metro accessible. The staff on hand are friendly and helpful, especially Mumbi, the manager. I recommend OSI Offices to all of my fellow entrepreneurs.

— Kiki Strickland

OSI is great if you are looking for flexible office space. Can't beat the location, office options and cost. Depending on your needs, they have a variety of office set-ups and sizes. You can also book larger conference rooms. Due to the nature of my work, I like having the flexibility of booking a room when I need it. I use it to meet with clients and to get administrative/paper work completed without interruptions. The management is wonderful to work with-- they are accommodating, flexible and care about their clients (and that's hard to find in this day and age). I highly recommend OSI if you are looking for flexible or temporary office space.

— Bluegreen J

I've had an exceptional experience with OSI Offices. The professionalism and support provided by the entire team have been outstanding from day one. The work environment is always clean, well-managed, and provides an inviting atmosphere. A special thank you to Manager Mumbi Thande, whose leadership and attention to detail truly set the tone for the welcoming and efficient environment. Mumbi goes above and beyond to ensure tenants' needs are met and creates a sense of community that’s rare to find in shared office spaces. I highly recommend OSI Offices to any business looking for a reliable and supportive office solution.

— Jay Hobbs

— Finess225

"I have been with OSI Management for over 4 years now. I did my research prior to selecting a virtual office company and OSI offered far more favorable options and price points than the other companies of both comparable and larger sizes did. In addition, OSI has the personal touch - from management to office staff - that I love. I have the options of mail services, office rental and also dedicated office space as my ever-changing needs require. I have recommended, and will continue to recommend, OSI Management! "

— Melanie Mfume

"We have been with OSI Offices since 2015 and have been very pleased. Great location and wonderful staff, headed by Mumbi Thande. Our Foundation appreciates all the courtesies and consideration afforded us as a non profit organization serving the working poor of the District of Columbia. Positive Responsiveness, Quality, Professionalism, Value"

— Brian M. Mulholland

Great location on Metro line with consistently responsive management staff for small business or practice needs.

— A Washington

We have been with OSI Offices since 2015 and have been very pleased. Great location and wonderful staff, headed by Mumbi Thande. Our Foundation appreciates all the courtesies and consideration afforded us as a non profit organization serving the working poor of the District of Columbia.

— Brian M. Mulholland

"OSI has been instrumental in building my psychology practice for nearly 10 years. I started with hourly office use; graduated to a shared office space; and for the past few years have my own private full-time office. The quality and array of services along with the flexibility of plans are invaluable."

— Diane Kern, Ph.D. Licensed Psychologist

— John Poindexter

— R. THAXTON

"I love the set-up of OSI, and I appreciate the spaces that are available to provide private therapeutic services to clients. I started my private practice last year and needed a part-time office space to suit me and my clients' needs. This space is perfect! I also appreciate the community. Mumbi is an amazing leader, and all of the staff are wonderful. They are so helpful, kind, and professional. I feel blessed that I found this location in DC."

— Simone H

"OSI has met the business needs of my law practice for almost 15 years. The office services are both comprehensive and reliable. The staff is well-trained and unfailingly courteous The handling of the mail and deliveries is dependable. My clients have commented favorably on the facilities and well-appointed offices."

— Chris Leflore Esq.

"OSI has been instrumental in growing my business from a few evening a week to a full time thriving practice. The front desk is approachable and helpful, always willing to help me when I need some administrative support. Mumbi, the office manager, is a joy. She has consistently been attentive to the needs of my practice and invested in helping me establish systems that keep my business working seamlessly. The variety of services OSI has offered me has been invaluable. The office suite is safe and secured at all times of the day, mail is delivered in a timely fashion, and my account is charged automatically on a monthly basis. Even when I am out of the office, I am notified when a package arrives for me. As a sole proprietor, I lack the luxury and assistance of an HR department, IT team, and an administrative specialist. Mumbi, Joseph, Jack, and the front desk have all stepped up at various times over the past two years to ensure I have an office space that works on behalf of me and the people I serve."

— Christina Moynihan, MSW, LICSW

I started my small business with OSI Offices, and they have been more than just an office space provider – they’ve been like a guardian to my business. From day one, their team has motivated and supported me in every aspect of my entrepreneurial journey. It’s not just about having an office; OSI offers invaluable in-house resources, including connections with experts in tax, finances, and company formation. The affordability of their services, especially for such a prestigious K Street location, is unmatched. Having my business office at this address has built trust with my clients, giving my business a level of professionalism and credibility that only OSI could provide. I see OSI and its employees as my partner in my business journey.

— Tareque Mehdi, Ph.D.

"I have been with OSI Management for over 4 years now. I did my research prior to selecting a virtual office company and OSI offered far more favorable options and price points than the other companies of both comparable and larger sizes did. In addition, OSI has the personal touch - from management to office staff - that I love. I have the options of mail services, office rental and also dedicated office space as my ever-changing needs require. I have recommended, and will continue to recommend, OSI Management!"

— Melanie Murray Johnson

— YOLONDA M “Lonnie” M

I have been using OSI's service since 2015. The service is excellent. OSI was still open during COVID-19, and has not raised its price for many years. Highly recommended!

— Feng Shan

— M. Smith

OSI Offices was extremely easy and pleasant to deal with. Their prices were very reasonable and I was able to customize my payment plan so that I was only paying for the services I needed as a small business owner....not to mention the fast internet and wealth of tech services they provide to help me automate many of my processes...Great!!

— David Finberg

I have been with OSI Management for over 4 years now. I did my research prior to selecting a virtual office company and OSI offered far more favorable options and price points than the other companies of both comparable and larger sizes did. In addition, OSI has the personal touch - from management to office staff - that I love. I have the options of mail services, office rental and also dedicated office space as my ever-changing needs require. I have recommended, and will continue to recommend, OSI Management!

— Melanie Murray Johnson

"Great location on Metro line with consistently responsive management staff for small business or practice needs."

— A Washington

— Tobie Whitted

Very well run. Friendly and efficient staff. Reasonable rates. Very pleased client.

— Mary Dolan

Great Customer Service!

— Uyghur Kayser

"I rented from OSI for years and had a wonderful and supportive environment and experience with them. Highly recommend to anyone looking for the same. The staff are professional, welcoming, responsive, and reasonable. Much appreciated!"

— Christina Domenichiello

I have rented space from OSI for the past 11 years. I like the comfortable relaxed non-presumptuous atmosphere of the office suite but still has a professional feel to it, I have found the office staff to be helpful in meeting all my professional needs.

— Michael Kaufman

A awesome group of Professions and great Office space. The location is unbeatable in the heart of Downtown Washington DC. OSI has truely been a driving force in our Companies sucess since 2006 and highly recommend OSI Offices.

— Ramsey H

"I have been using OSI's service since 2015. The service is excellent. OSI was still open during COVID-19, and has not raised its price for many years. Highly recommended!"

— Feng Shan

"I have rented space from OSI for the past 11 years. I like the comfortable relaxed non-presumptuous atmosphere of the office suite but still has a professional feel to it, I have found the office staff to be helpful in meeting all my professional needs."

— Michael Kaufman

"I have been back with OSI for slightly over 3 years. This is my second stint with OSI, having previously been with them from from 1985-1996. OSI offers the best possible set-up for a lawyer such as myself who is a sole practitioner. I have a litigation practice, so it is imperative that my mail and telephone logs be meticulous, and that my clients and witnesses be accommodated at all times. I could not be happier with OSI. The OSI staff is outstanding—courteous, efficient, and always willing to go the extra mile for a client. The OSI management is fabulous. Jack Pearce and his managers always know what technology is on the cutting edge for attorneys, and offer mini-seminars to ensure that the attorneys renting from OSI are kept abreast of all the latest Court-ordered innovations. As an example, when the D.C. courts went to mandatory electronic filing, OSI installed copiers and scanners that would accommodate the largest of jobs. Now, thanks to OSI technology, I can handle electronic discovery in huge proportions. I would highly recommend OSI to any small business that needs a big business presence."

— John Davis

"I have been utilizing this space since August. All the staff are friendly and very helpful. The free coffee and tea and waiting room really enhance my experience. The location and rate for rental literally cannot be beat and trust me I have looked. I just wish that we had our own parking garage or discounted garage."

— Mychelle Williams

I love the set-up of OSI, and I appreciate the spaces that are available to provide private therapeutic services to clients. I started my private practice last year and needed a part-time office space to suit me and my clients' needs. This space is perfect! I also appreciate the community. Mumbi is an amazing leader, and all of the staff are wonderful. They are so helpful, kind, and professional. I feel blessed that I found this location in DC.

— Simone H

"Saffold and Associates has been a long time (10+ years) and loyal customer of OSI. The virtual office model was great while we were building the business and clientele. Once we outgrew the virtual office model we decided to rent full time offices on the 1629 K Street 3rd floor suite. The offices are well-maintained and cleaned daily with a professional cleaning service. The ladies at the front desk make our client feel welcome and are excellent at receiving evidence and payments from clients. Finally, the location (Farragut Square) and amenities (high-speed printer/copier/internet) cannot be beat!"

— David Saffold, President.

"Awesome group and very pleasant to work with. Best prices in D.C."

— Makeba Armstrong

“I retired from my full time solo private practice as a psychologist but wanted to have office hours on a part time basis. OSI and I worked out an office service plan that fit my needs perfectly, at a very reasonable cost. I have been a very satisfied customer with their services and would recommend OSI to anyone needing part time or permanent office services.”

— Joseph Quintano Ed. D. Psychologist

Prompt and efficient service. Everything you need to start inning your business.

— Brittany Kerr

"OSI Offices was extremely easy and pleasant to deal with. When I needed a Washington virtual office space their prices were very reasonable and I was able to customize my payment plan so that I was only paying for the services I needed as a small business owner....not to mention the fast internet and wealth of tech services they provide to help me automate many of my processes...Great!!"

— David Finberg

I rented from OSI for years and had a wonderful and supportive environment and experience with them. Highly recommend to anyone looking for the same. The staff are professional, welcoming, responsive, and reasonable. Much appreciated!

— Christina Domenichiello

I have been utilizing this space since August. All the staff are friendly and very helpful. The free coffee and tea and waiting room really enhance my experience. The location and rate for rental literally cannot be beat and trust me I have looked. I just wish that we had our own parking garage or discounted garage.

— Mychelle Williams

"I have used O.S.I Management Inc. services for several years from 2008 to 2010 and again since 2013 for my law office. I always have been very satisfied with the professionalism and responsiveness of the owner, Mr. Jack Pearce and his new manager, Ms. Mumbi Thande. O.S.I. has been flexible and accommodating to my business needs more than once. In 2013, when I re-established my practice, I would not have chosen to go any other place than to O.S.I. - I just called Mr. Pearce and an hour later, I was all set! Their prices are competitive, the team is always kind and available and I never experienced any glitch. A big thumb up for "Jack" and his team! "

— Cécile Neuvens

Great office location. Well run

— Erik Cohen

Started my therapy practice here, which ended up being perfect. The flexibility it provided for my hybrid set-up, during Covid too, was great. Staff is super friendly and helpful, location is great, and my clients always felt very welcome. Now moved on to having a full time office space down the street, but look back fondly at my time there.

— Tim van den Broek

I have been back with OSI for slightly over 3 years. This is my second stint with OSI, having previously been with them from from 1985-1996. OSI offers the best possible set-up for a lawyer such as myself who is a sole practitioner. I have a litigation practice, so it is imperative that my mail and telephone logs be meticulous, and that my clients and witnesses be accommodated at all times. I could not be happier with OSI. The OSI staff is outstanding—courteous, efficient, and always willing to go the extra mile for a client. The OSI management is fabulous. Jack Pearce and his managers always know what technology is on the cutting edge for attorneys, and offer mini-seminars to ensure that the attorneys renting from OSI are kept abreast of all the latest Court-ordered innovations. As an example, when the D.C. courts went to mandatory electronic filing, OSI installed copiers and scanners that would accommodate the largest of jobs. Now, thanks to OSI technology, I can handle electronic discovery in huge proportions. I would highly recommend OSI to any small business that needs a big business presence.

— John Davis