How do I find the primary room area, year of construction and type of housing for my residential property. You will find this information in your tax return for the 2015 income year (the 2015 tax return), which you received in 2016. Click here to find out how to access previous tax returns electronically. The information will be shown on page 2 under "Grunnlag for likningsverdi, item 4.3.2 Bolig/Boligselskap" (Basis for tax value, item 4.3.2 Housing/Housing cooperatives"). Remember that you must be the owner of the property.