Help me find out where my grandfather lived in Tynagh

The Andrew Slattery at Lissanard East townland Tynagh parish Co. Galway is listed on Griffith's Primary Valuation as holding a house and offices and sharing about 20 acres of land - the plot reference is 2a. The black and white maps on AskAboutIreland show 2b as being at the location of the northern group of buildings surrounded by trees on this google map. The coordinates are : 53.13282401, -8.32496859 - the buildings appear to be currently used as farm outhouses.

see attached some maps ...
 

Ballyleen townland is adjacent to Lissanard east townland - it's given as the residence of Annie Slattery at the time of her marriage to Patrick Slattery in November 1920, the marriage took place in the Catholic church at Tynagh village, which is a short distance to the north west of Lissanard east and Ballyleeen. At the time of the births of their eldest two children the couple (Thomas & Mary Anne) are listed as living at 'Lisanard' - no specific mention of East or West.

There are no Slattery .households listed for Ballyleen townland at the time of Griffith's primary Valuation, which is dated 1856 for this area, the only four Slattery households listed for the civil parish of Tynagh are those mentioned earlier - John with a house in Tynagh village, and a group of Mary, Michael and the previously mentioned Andrew at Lissanard East. Mary is adjacent to Andrew, 2a for him 2b for her, and sharing the land, and Michael is listed at plot 5, so a little to the east of Mary & Andrew.

In 1901 there is a Slattery family at Lissanard East which appear to be a good match for Annie's family - with father Andrew as per the marriage, there are also two additional Slattery households in the same townland, one of which may be Patrick's family. On the same census there is just one Slattery household shown in Ballyleen - head is a 70 years old Peter, his son Andrew and wife Bridget along with their five children.

To follow the properties forward to later years requires research at the Valuation Office in Dublin city, they hold Cancelled Land Books/Revaluation records which follow land holdings forward in the same format as the Primary Valuation, i.e. complete with plot references and maps.

The following is the google aerial view of plot 5 area, the blue circle indicates the location of Plot 5 - difficult to be certain for these views, may be an older building, the adjacent house to the north east is a new building.

The coordinates for this site are : 53.13153, -8.320245

The place to start is with the Valuation Office I mentioned above, the records are in a similar format to Griffith's and carry forward to about the 1970s for most areas. The records are Revaluation Books/Cancelled Land Books with a new volume about every 10 years, many of these have been digitized and available to view in their office in Dublin city, unfortunately they are not available online yet, but there are apparently plans to do this at some stage in the future (Those for Northern Ireland are). The website was Valoff.ie but is now part of a larger system called Tailte.ie , I dont currently have a direct link to the Valuation record section, they should be able to do a search once you can give them a precise area - i.e. county/civil parish/townland along with a plot reference (e.g. 2a, 5 etc) and maybe a name (head of household)

For more recent searches it's more complex as not all are registered, as a starting point see these links Citizizens information - Property Deeds and Landdirect.ie
 

You may also find the following site useful - allows a map search and check by EirCode (a unique post code) : LandRegistry Ireland
 

note : covers FreeHold Registered property.