First I hope my english is comprehensible. I'm student and writing by order of my best friend.
He is searching for information about his ancestor Gehring who migrated from Germany to Houston round 1870.
Also he is very very interested in information about the house his ancestor should have built. The house today is a listed building (or do you say "landmarked"?) as far as he knows and has a sign on it which shows that it once was built by ??? Gehring.
A descendant of him is Viktor Gehring.
Unfortunately that's everything we can tell about it. I hope you can help us with it or at least tell me where I can get further information.