People use architectural scale models for all sorts of interesting things. They may use building architectural models as part of a demonstration to pitch an idea to a potential customer, or they might use architectural scale models to compare and contrast the features of two buildings under consideration. However they choose to use these models, people often hand over their schematics to professional architects and let them take over.
The people creating these architectural scale models are fully prepared to know every corner and every element that must be carefully considered for these drawings to fully interpret their full scale counterparts. This includes both fully functioning buildings and drawings or ideas of buildings that have not yet been created. Through architectural model building, these architectural model makers devise either what buildings look like on a smaller scale or what they would look like had someone picked these models for a full scale approach.
The architects making these architectural scale models do so as a component of their overall services. Normally, they charge a fee to come up with the models and then a different fee to actually execute a formal plan to create a larger version of that model. Architects with lots of experience creating these renderings in scale form often do this work within a pretty short timeframe, though this will depend on the complexity of the drawing or of the actual model. But when all is said and done, these models can really showcase a building.