Not sure that this is the one, but...

MANSION OVER THE HILLTOP

I'm satisfied with just a cottage below
a little silver and a little gold
but in that city where the ransomed will shine
I want a gold one that's silver-lined

CH> I've got a mansion just over the hilltop
in that bright land where we'll never grow old
and someday yonder we will never more wander
but walk on streets that are purest gold

Don't think me poor of deserted or lonely
I'm not discouraged, I'm heaven bound
I'm just a pilgrim in search of a city
I want a mansion, a harp and a crown

I'm not sure of the whole thing, my grandma sings this in church. i really like the song though

"......one day i'm going to walk on streets of pure gold....."

that's all I can remember.. does anyone have the complete lyrics??