R4 zoning in Sweetbriar neighborhood (District 2)

In 2016, our school-teacher daughter bought a super-affordable little home in the Sweetbriar neighborhood near S. 1st St. and Stassney Ln. The neighborhood is relatively untouched, with most of the homes still at their original sizes (850-1,000sf). Hers is an amazingly efficient 3/1 in only 850 sf, in fact!

What would the new code allow on her lot?? Here's the first example, with the R4 zoning that's mapped for her property:


That massive building above is a 3-unit multifamily building, sitting in place of her current home (which went to the landfill for this scenario).

Right now, this neighborhood offers a remarkable level of affordability, considering that her house is precisely as far from City Hall (4.7 miles) as my home in Rosedale. If we upzone it dramatically, the bulldozers will find this neighborhood (and others that are similar, like Highland, or North Shoal Creek, for instance). Will the bulldozers bring greater affordability, or will the existing residents (renters and lower-income homeowners) be displaced in large numbers?

Here's how the scenario works:
Site Plan/Data

Elevation- The vaulted roof shape allows the entire 3rd floor to leverage a loophole in the code, exempting it from the FAR limit.