In Connecting to Collections Care, we just did a webinar,
Planning for Natural Disaster Damage in Botanical Collections, that is not directly related to your question, but it does consider plantings, gardens, grounds and their value in emergency planning. YOU might find it helpful:
Planning for Natural Disaster Damage in Botanical Collections
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M. Susan Barger PhD
Coordinator Connecting to Collections Care
Foundation of the American Institute & Artistic Works (FAIC)
Washington DC
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Original Message:
Sent: 03-17-2019 01:13 PM
From: John Daab
Subject: Appraising the value of a small museum
Our small museum's collection has been appraised in the past but I have found little information on appraising the total value of the building, land,configuration of the land in terms of greenery, walking paths, ponds, eating and rest areas, gardens, and the many outdoor sculptures. Any thoughts would be helpful.