Specialist properties are relatively complex and difficult to value due to the lack of comparable evidence. It's worth studying how advanced technologies are used for these valuations.
What are the challenges of employing advanced technologies in specialist property valuation?
https://apacresearch.cbre.com/research-and-reports/building-a-smart-future-property-valuation
https://www.unissu.com/proptech-resources/property-valuation-and-appraisal-technology
https://www.praxivaluations.praxi/newsdetail/30/Digital-Technology-for-Real-Estate-Valuation
Do recommend especially the 3rd link.
The obvious one is that we say for a typical house in a specific area the price per square metre is £X. Adding one more room is worth £Y etc etc. Here we can use large amounts of historical housing transactions to develop our price model. But with one-off style buildings this is more difficult. Then it becomes a question of taste and the balance shifts to the demand (customer) side rather than the seller side.
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