Retirement accounts are designed to be invested passively so when the IRS sees you running an active business in it, to level the playing field between retirement accounts and other business the retirement account incurs UBIT. 

Adding and making better could sell or rent faster, but it won't get you more than what the market ARV and rent is set at from other similar comps in the area....and your Interior Design background will help, if you you it mostly as an understanding of cost. 

Their contribution depends on factors like local demand for ADUs, their design and size, and how they’re used (e.g., rental income potential).

I am not going to sugar coat it, going direct to seller is a FULLTIME MECHANICAL "JOB" but I was able to build a rental portfolio from doing this day in and day out. 

There are never full photos of the mechanicals and basement and roof line so you will never have even a bare inkling of what the potential repairs will be.

Links/references- https://www.canva.com/design/DAFHd-6ryQ8/_T6h0Y9jV0zIEADl6bq... - https://therentalgirl.com/tichttps://andysirkin.com/tenancy-in-common-tic/operating-and-m... - https://www.stonesalluslaw.com/tenancy-in-common-in-californ... - https://www.investopedia.com/terms/t/tenancy_in_common.asp - https://www.rocketmortgage.com/learn/tenancy-in-common - https://www.allcalifornia.com/tenancy-in-common - https://andysirkin.com/tenancy-in-common-tic/guidance-for-se... - https://www.dre.ca.gov/files/pdf/tic_guidelines.pdfby the way I received a lawyer referral who is supposedly familiar with tic in California.  

They have a team of designers who do it online.

Assumed nothing could possibly go wrong in the next 5 years what you want when you look at an investment property is to know the current rental amounts, specific expense items, and conditions of the building, grounds, and mechanical systems.  

Investing in features like high-end appliances and modern designs yielded a higher ROI.

This designation doesn’t cost extra or give the manager access to insurance payouts but ensures you and the property manager are aligned during incidents, such as tenant lawsuits or insurance claims.