The Trinity Lutheran Church Local Historic District consists only of the church at 1345 Gratiot Avenue named Historic Trinity Lutheran Church. You can read details about this church in the Trinity Lutheran Church Historic District Final Report (local copy), which I recommend highly to anyone interested in Detroit's history.

My photos of this church can be seen in this slide show.

A Wikipedia Page also describes the church, as well as www.HistoricTrinity.org, HistoricDetroit.org, and DetroitHistorical.org.