'The first garden city experiment in Finland was Eliel Saarinen's Munkaniemi-Haaga plan of 1915, but it was so much ahead of its time the owner of the estate did not dare to carry it out'. Leo Aario, 'The original garden cities in Britain and the garden city ideal in Finland.' Fennia 154, 1986 pp. 157-209 (p. 157)
The image below (original here) is a 2017 visualisation of the plan. Apparently the buildings 'are imaginary, but the street lines follow Huopalahdentie and Munkkiniemi park road.'
I can't tell what, if anything, in this plan constitutes an internal reserve but I suspect that the majority of the plan is apartment blocks (with interior courtyards) and some low-rise housing at the bottom and a lot more at the top, with a few genuine internal reserves dotted throughout.
