Reference for Negaim 13:2
הָאֶבֶן שֶׁבַּזָּוִית, בִּזְמַן שֶׁהוּא חוֹלֵץ, חוֹלֵץ אֶת כֻּלּוֹ. וּבִזְמַן שֶׁהוּא נוֹתֵץ, נוֹתֵץ אֶת שֶׁלּוֹ וּמַנִּיחַ אֶת שֶׁל חֲבֵרוֹ. נִמְצָא חֹמֶר בַּחֲלִיצָה מִבַּנְּתִיצָה. רַבִּי אֶלְעָזָר אוֹמֵר, בַּיִת הַבָּנוּי רֹאשׁ וּפִתִּין, נִרְאָה בָרֹאשׁ, נוֹטֵל אֶת כֻּלּוֹ. נִרְאָה בַפִּתִּין, נוֹטֵל אֶת שֶׁלּוֹ וּמַנִּיחַ אֶת שֶׁל חֲבֵרוֹ:
A cornerstone, when he removes it, is removed in its entirety, but when he destroys [the house], he destroys what belongs to him but leaves what belongs to his neighbor. We find a stringency in the case of removal beyond that of demolition. Rabbi Elazar says, a house built with a cross-beam and a king-beam, if it appeared on the cross-beam he must remove it all, if it appeared on the king-beam, he removes what belongs to him but leaves what belongs to his neighbor.