My partner and I were going to do the job ourselves we had the home surveyed, appraised, feasibility study done, inspected , engineering plans drawn and architectural plans drawn however we are short about $120k for purchasing costs.

We bought a 1/1 condo that my husband completely renovated mostly on his own (my husband is a contractor w/ a background in architecture). 

I have 17+ years in the architecture, design and construction industry.

For example, call a roofer and ask what their average cost per Square of Architectural Asphalt Shingle Roofing would be on a 1,500 sf house, with a 6/12 pitch

I started out my career in architecture and after 7 years received my license to practice in California.

How does it affect value and rentability, compared to standard architectural shingle roofs?

There’s plenty of historic architecture that for the right price will be greatly appreciated renovated.

They will typically require professional architectural drawings, building permits, licensed contractors, etc.

Second, go looking for a local-ish (depending on the size of your city) architecture firm that has experience doing MF.

And while the amazing architecture of ONE, OSE, and Kenwood has a lasting appeal, I do worry about rents and vacancies once all of the cranes come down and inventory geometrically increases near downtown.A 1031 exchange would let you and your brother separate.