An e-mail to one of your clients letting them know about your move, then A letter to your cleaning company letting them know that you will not be needing them any longer.
What is the specific format of an email and a letter I need?
Try to avoid speaking out about your negative information. Keep a positive tone in your diction and words.
Situation:
You are a partner in a small accounting company that was established five years ago. For your first five years you have worked out of a small leased office space.
This has served your clients well and many have come to you because of the convenience of your location. During that time you also hired a small family-run business to provide cleaning services for your office. One cleaner comes each evening to do daily tasks and once each month a team of two comes to take care of larger things like carpet cleaning. You have gotten to know the regular cleaner quite well over the years and you have been happy with the service they have provided.
Your lease has now expired and you have decided to move to a new, larger location in a large office building close by. Unlike your current location, your new office building offers cleaning services as part of the leasing cost. It also has spots for client parking that you current location lacks.

The question above requires the student to write an email to one of his/her clients revealing about his next move and a separate letter to a cleaning company telling them that their services will not be required anymore.

Subject: Notice about the next move to be made about our services

Notice is hereby forwarded to you my dear client about the possible changes and moves to be made to make providing services to you much affordable and sufficient. We have worked for quite a long time on my former accounting company and we have interacted a lot and known each other well. However the big surprise is that my lease period on the company has expired, and from now henceforth  henceforth i will be moving to a new much larger company which also offer cleaning services as part of the leasing cost, in addition to this it also has a spot for parking which my current company lacks. Therefore I hope we will continue interacting on everything and you are highly welcomed to taste our new products and services. I'm still looking forward to meeting you again anyway I appreciate our past relations and interactions.

A letter to the cleaning company telling them that their services are no longer required

From: Public accounting company

To   :Skynet cleaning company

A letter is hereby written to let you know that your services as a cleaning company are hereby terminated for a foreseeable future due to expiry of my leasing period and as a result I've moved to a much larger company than my current one and I'm afraid that once i quit nobody would be able to shoulder your cleaning fees and dues hence call for its end. I want to appreciate the company and the staff for their cooperation and interoperability we have managed to have over the years ever since, this has enabled us to grow even closer and know each other in person thus greater working conditions and terms, I will really miss this team of your company, However where I'm moving on there are also cleaning duties but seems like they have their own team for that. Anyway I want to thank you for your work and cooperation thanks in advance.

Step-by-step explanation

Subject: Notice about the next move to be made about our services

Notice is hereby forwarded to you my dear client about the possible changes and moves to be made to make providing services to you much affordable and sufficient. We have worked for quite a long time on my former accounting company and we have interacted a lot and known each other well. However the big surprise is that my lease period on the company has expired, and from now henceforth  henceforth i will be moving to a new much larger company which also offer cleaning services as part of the leasing cost, in addition to this it also has a spot for parking which my current company lacks. Therefore I hope we will continue interacting on everything and you are highly welcomed to taste our new products and services. I'm still looking forward to meeting you again anyway I appreciate our past relations and interactions.

A letter to the cleaning company telling them that their services are no longer required

From: Public accounting company

To   :Skynet cleaning company

A letter is hereby written to let you know that your services as a cleaning company are hereby terminated for a foreseeable future due to expiry of my leasing period and as a result I've moved to a much larger company than my current one and I'm afraid that once i quit nobody would be able to shoulder your cleaning fees and dues hence call for its end. I want to appreciate the company and the staff for their cooperation and interoperability we have managed to have over the years ever since, this has enabled us to grow even closer and know each other in person thus greater working conditions and terms, I will really miss this team of your company, However where I'm moving on there are also cleaning duties but seems like they have their own team for that. Anyway I want to thank you for your work and cooperation thanks in advance.