matte material (frosted glass), -! Is a very simple mat.
For the foundation you need to take an ordinary VRayMtl .
Diffuse it should be as dark to frosted glass was not as white as you have, and the dark, as in this picture thee. It can be black.
Then you need to give a bit of reflection. Do Reflect slot slightly gray. And do not forget to blur the reflection, reducing the value Refl. Glossiness.
Do Refract color light gray, almost white.
The lighter, more transparent mat.
In principle, you can make white, too, will look good, but the sandblasting is still not entirely clear, because it is glass, polished jet of sand.
And now blurring the transparency to objects behind the glass It was not clear and blurry as you need.
To do this, one may say the value of Refraction Glossiness. The lower the value, - the greater the blur
The specific values in your case is not appropriate, you must own to your liking customize material
render region only this facade to bestolku not pererenderivat whole scene for the sake of one glass façade
Did mat -. render. What is not satisfied? I figured out what is wrong and render again, and so as long as you will not achieve the desired result.
And yes, another check in the V-Ray :: Global switches whether you checked Glossy effects, because for Refraction Glossiness 0.85, how are you in the mat - blurring objects behind the glass is very small. More precisely, I do not watch it😁
In your case, it is not in the material, and in the technique of the internal illumination in V-Ray. Read the topic, about, how to install lights in the ceiling using the V-Ray, and only then go on to actually issue setting the ceiling material😉