., super fancy granite counter tops) but "solid" (mid-level in price/quality) that give the ADU a modern look and feel and a foundation of materials that would last a fairly long time without being refurbished.She is getting quotes with a fairly wide range, from $140K all the way up to $190K.Thanks in advance!

There will be a fundamental shift in the landscape of what we perceive as the modern economy and already taking place of "de-globalization". 

I'd get a black one, then all the appliances are black.If you could change out the sink for one that's a single sink with a new faucet like the one in the picture linked below, it would make it look a lot more modern and I love the new ones - it's so much easier to wash a huge stock pot. 

option=8588011If you could afford it, some waterproof bamboo flooring in a really light color would be really nice and modern: https://www.homedepot.com/p/LifeProof-Bay-Point-7-mm-T-x-5-2-in-W-x-36-22-in-L-Waterproof-Engineered-Click-Bamboo-Flooring-13-07-sf-case-HL675/311344072And then paint the walls in a really light color that matched the wood tone of the flooring.  

I would definitely do more research, utilize modern tech and look for areas that you have some sort of interest in.

Problem is the undertones in your floor are yellowish and the modern look everyone seems to want is white and gray.

Upscale, modern, space saving things will typically increase the unit's value, competitiveness, and rent, especially in the small units. 

And young professionals love to have a nice clean, more modern one.

A class brand new just built all sorts of modern amenities including big GYM  maybe day care  coffee shop etc.. all within blocks of each other same public transportation and same schools.. this is where the New buildings could have big move in bonus's and renters leave the lower tire props for the brand new one.. you still need great/good credit to get into ABC in Portland..  

Or, they could even apply at the apartment with a laptop if you have one.