That is looking ace!
This line exemplifies exactly how I see MDF buildings ought to be; as a blank canvas, to be tarted up by us hobbyists.
The way you've done this, completely hides the fact that there is an MDF shell underneath, whilst other companies try and offer every detail of a building with MDF. And even though that's perfectly acceptable as a gaming piece, and certainly sturdy, it always shows.
MDF is not a miracle medium, and handrails, windows, signs and other finer detail will look clumsy and bulky when done in MDF. As if our miniatures are walking around in Lego City.
But your building craftily avoids all that, so hats of to you, good sir...
Please keep 'em coming!