For those who are looking information on a particular family estate should have a look at the Finnish Agricultural Museum's website. They provide information about family estates in Finland. You can search for estates in the following address: http://sukutilat.sarka.fi.
Currently there is over 26 000 family estates listed. You can do searches by municipality ("kunta"), village ("kylä"), estate name ("tilanimi") and owners surname ("omistajan sukunimi").
The resulting description (in finnish) has basic data on the estate and in many cases a picture of the last owner. You can copy-paste the descrition to Google Translate in order to get an English version.