Radnorshire Wildlife Trust is set to move from its existing premises at Warwick House, High Street in Llandrindod Wells to new offices.
The move will see the charity vacate Warwick House, which has been its home since the early 1990s when the building was bequeathed by the late David Garman.
James Hitchcock, CEO of Radnorshire Wildlife Trust said: “Warwick House has served us well over the years allowing us to raise the profile of the charity with a ground floor retail unit while also housing staff offices on the upper floors and a useful workshop and storage on the lower ground floor.
"Unfortunately, the time has come for us to adapt our working arrangements and a large open plan office for us will allow us to work more collaboratively as our team sizes have grown for the various projects we are involved with.
“We are excited to be moving but will also be sad to leave Warwick House behind and hope that the next occupiers will enjoy being so close to the town centre and with parking directly in front.
“Our new offices at the Automobile Palace are in the process of being fitted out so we will be looking to move over the coming months.”
Radnorshire Wildlife Trust is one of six wildlife Trusts in Wales and employs 15 people in Llandrindod Wells working to increase the abundance and diversity of wildlife across Mid Wales, inspiring people to take action for nature and helping to reduce the impact of climate change.
Stuart Hogg Property Consultants have been appointed to market Warwick House either for sale or to let.
Stuart Hogg said: “Warwick House is a great opportunity for either an owner-occupier business to combine offices and retail functions or potentially generate rental income by letting the various elements of the property, offices, workshop and retail.
"The property has retained much of its original character and is a great example of Victorian architecture with traditional shop front and feature balcony on the first floor.”