These are the plans originally approved by the LEC for 19 Cabban St, showing a constant width, wider side return. 

These are the Council plans to which the Respondents property was built, after an S4.55 DA modification was made to the LEC Plans, showing a reinstatement of the stair block, resulting in a narrowing of the side return vs. the LEC Plans. Page 4 & 5 call out these changes

The Updated Statement of Environmental Effects explains and justifies the reason for these changes in Annexures B & C on page 36 & 40 respectively