You can read site property changes from the general audit log using SQL, but this is clunky and I agree Service Centre should have a better way of handling this.
with cte as
(
select * from oslog_general_0 with (nolock)
union select * from oslog_general_1 with (nolock)
union select * from oslog_general_2 with (nolock)
union select * from oslog_general_3 with (nolock)
union select * from oslog_general_4 with (nolock)
union select * from oslog_general_5 with (nolock)
union select * from oslog_general_6 with (nolock)
union select * from oslog_general_7 with (nolock)
union select * from oslog_general_8 with (nolock)
union select * from oslog_general_9 with (nolock)
)
select top(20) *
from cte
where Espace_Id = 0
and Message_Type = 'INFO'
and message like '%site property%'
order by Instant desc