This park is most likely not "shops and offices".
And "A little fountain" (RES_00_06) is not a "Residential house".
The thing is, according to the DAT parameters
, citybuildings can be one of these types:
res residental building
com commercial building
ind industrial building
tow city hall
cur curiousity buildings
hq company's headquarter
So, what type, among these, would a park be? Technically, none of these.
Parks, churches, sport fields, leisure clubs, balloon launch fields and other places of public interest are considered "institutional use". Well, at least that was what my Urban Planning teacher told me in Architecture School.
To solve this issue properly, Simutrans should have institutional citybuilding type (perhaps, INS) to be used in DAT files, since parks are not residential nor commercial use buildings.