Diane, hello we have corresponded on Johnson previously in Leitrim, this is a quick answer and I will revisit late in the week. The Old Mohill Facebook page last night or today had a poster who put up a death cert for Burns if you want to have a look.
I see your Burns on Griffiths Valuation in Mohill main street, renting two properties from both Crofton and the infamous Lord Leitrim, they also owned a piece of property in Mohill, using the Ask About Ireland site you can get plot numbers and maps but a tricky read or manipulation. Knowing the site or plot number you can see it on the OSI site I think. If in Dublin you can visit the Valuation Office and see who owned the plot up to about 1970, getting there is the issue but free then, a solicitor or lawyer to you could probably trace it for you too but probably expensive to just get an address.
Oddly I recently found ancestors in Clonguish, before Christmas on a Longford Genealogy page someone posted a link to the PBS station in the US were some actress was briefly in Clonguish for ancestors or it was mentioned, it was apparently on the stations site for awhile but probably gone now, however I am on the Longford FB age and can check if you want.
I am rushing just now but will have another look on Tuesday if you wish.