I picked up this set of 1/300 buildings off ebay from a seller called "aylafred". They produce a range of resin buildings in 1/300 and 15mm at a reasonable initial bid offer - I picked these up for a little over £5.00.
I base coated them in artists white gesso, painted them a sand colour and washed them with sepia ink.
The doorways have curtains made from aluminium cooking foil.
All in all a nice set of models available at a reasonable price. Very few blemishes, bubbles, etc. Good flat bases with no distortion. Should be suitable for any African/Middle Eastern campaign from ancients through to the modern era, except the fort, which would suit 19th Century onwards.