Real Estate / Can I sell my home in Poland remotely? [2]

No. Your wife needs notary power of attorrney. So, u have to find polish notary or go to the polish consulate in USA (consul can make notary POA too).

Law / Registering sp. zoo with person who is not in Poland [4]

@diplomatic24x7

No, he don't need to be in front of notariusz. You need only partners resolution and future prezes zarządu statement.