How To Make An Eruv Chatzeiros

Question:

I am asking for guidance on how to make an Eiruv Chatzeiros in a Jewish owned building that predominantly has non-Jewish tenants.

Also, if there is an apartment that has changing tenants (for example unmarried girls or boys) that change every year, are they included in the Eiruv?

Answer:

First, one of the tenants should make a Sechiras Reshus by paying a dollar to the super or the owner to rent all the common areas.

Then;

1. Take some bread (challah or matzah) on behalf of all other tenants. The bread must be large enough to include at least a grogeres (one third of a beitzah, the volume that fits into two-thirds of a small matchbox) for each participant―which is the amount of bread normally consumed by an individual at two meals. There is a limit of eighteen grogros (six beitzim) to the eiruv, even if more than eighteen homeowners are participating.
   You may establish the eiruv even if all of the participants are not present, provided that one participant is present to acquire shares in the eiruv on behalf of the others. This participant should preferably be an adult, and not the dependent son or daughter of the one making the eiruv―even if they are adults.
2. Hand the bread to the other participant who acquires it on his own behalf and on behalf of all other participants (as described) by raising it at least one tefach (three-three and a half inches). The representative should intend to acquire the shares on behalf of all other participants―including anyone who may need to join the eiruv at a later time, their shaliach even if they did not designate him as such, because someone may act as a shaliach to acquire something beneficial for another person even without their awareness. It is considered as if each participant is present and has personally raised it in turn.

In this case, you do not make a Bracha and just say the following declaration:

בְּדֵין יְהֵי שָׁרָא לָנָא לַאַפוּקֵי וּלְעַיוּלֵי וּלְטִלְטוּלֵי מִבַּיִת לְבַיִת וּמֵחָצֵר לְחָצֵר וּמִבַּיִת לְחָצֵר וּמֵחָצֵר לְבַיִת וּמֵרְשוּת לִרְשוּת
בֵּין בְּשַבָּת זוּ וּבֵין בִּשְאָר שַׁבְּתוׂת הַשָׁנָה לָנוּ וּלְכָל הַדָרִים בִּשְׁכוּנָה הַזׂאת.

“Through this it will be permissible for us to take out, to bring in, to carry from house to house,
from courtyard to courtyard, from house to courtyard, from courtyard to house, and from area to area,
whether on this Shabbos or on any Shabbos of the year – for us and for all who live in this neighborhood.”

If the apartment switches tenants, they are included in the eiruv.

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