On 2/21/1901, the synagogue purchased a lot for its first synagogue from Ida W. Moller for $1500. You can read the deed in its entirety in this PDF. They sold this land in 1913 as they were beginning construction on the second synagogue, necessitated by the arson.
“Ammon Street was named in honor of Squire Ammon,” wrote the Homestead newspaper on 1/26/1917. The street also shared a name with one of the enemies of the Israelites.
An Ammonite or a Moabite shall not enter into the assembly of the Lord; even to the tenth generation shall none of them enter into the assembly of the Lord for ever; because they met you not with bread and with water in the way, when ye came forth out of Egypt; and because they hired against thee Balaam the son of Beor from Pethor of Aram-naharaim, to curse thee.
They remained enemies of Israel for centuries after. It must have struck the community as ironic that they were building their synagogue on a street hearkening back to an unwelcoming tribe!