Plans which could lead to the demolition of an historic country house have been criticised.
The 100-year-old house has been described as a "rabbit warren"
The Victorian Society has asked the Lake District National Park Authority (LDNPA) not to knock down Brockhole built in 1900 overlooking Windermere.
The LDNPA wants to turn it into a world class visitor attraction and says its "rabbit warren" of rooms and corridors are unsuitable for adaptation.
But the Victorian Society wants the arts and crafts house to be preserved.
The building was originally built as a family home and is not listed.
In 1945 it became a convalescence home for 20 years and inside there are virtually no original features left, according to the LDNPA.
The organisation hopes to spend £15m transforming the site.
However, Ann Morgan of the Victorian Society, said: "It is a fantastic, handsome house with landscaped gardens and we are very concerned.
"It is an interesting house from an architectural point of view, but also because it has close associations with the family of Beatrix Potter.
"Her cousin Edith Potter married William Gaddum the wealthy silk merchant from Manchester who built the house."
Richard Leafe, chief executive of the LDNPA, said demolition was an option.
He said: "We would want all options to be available when we come to a decision, it may include demolition but no decision has been made.
"We do need to look after the historic environment and we will be doing a full historic assessment of the site."