Has this land survey done professionally?

Thanks Peter and Tom for useful analysis.

I am just feeling trapped in mud.I checked the feuding neighbor's plat from town office and found that all numbers on that plat is fully consistent with the document #(X,plan of land in Belmont city) from Registry of Deed which shows that every lots are sealed without any space between.Now this survey produced a space of 100 sf.It seems he is intending to leave the explanation for the board of registration of professional engineers and of land surveyors.

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