Prorated taxes (I understand this part)what other items that i should see on my closing bill?

My current understanding is that ADUs may offer better cash flow, although they may not necessarily provide superior appreciation compared to condo investments, considering the anticipated decline in interest rates over the next couple of years.Thank you for your expertise and guidance!

Like for us in Oregon our customer service department when you ping them either call or e mail and ask for a TRIO.. within 30 minutes you get an e mail back with  copy of the assessor tax page showing tax info etc..

For our customers, they fall under our business license and tax.

So many nuances from property taxes, insurances, what does airdna or rabbit say, cost of internet, HOA, permit costs, local utilities, are you doing maintenance or is someone else.... 

They're like real estate taxes. 

Financing and tax related issues will force the other into becoming part of whatever you decide to do and you don't want to overcomplicate your marriage with financial decisions that both of you are not on board with wholeheartedly.That being said, there are other ways to invest in real estate that don't involve you moving or evening buying a home.

Mortgage, taxes etc amount to 1200 and HOA is 200.

And should they still file taxes separately or can they file jointly?

The basis could be the price their sister in law sold her house for 3,000 miles away; the amount of principal, interest, taxes, insurance, and repairs they put in (known as “make me whole”), an amount that makes clear they are not to be trifled with (“I won’t give it away!”)