@Keetaek HongI use QuickBooks Online (QBO) for my flipping business, rental businesses, and bookkeeping clients.However, many on the forums will advise against QBO.

I am seeing quotes around $120k which would put that cost per square foot around $600 which seems a lot compared to what I have seen/read online The reason your cost per square foot is so high is you still have to add all the things a regular house has but in a smaller space.

We use DealCheck to underwrite deals and QuickBooks Online for everything related to accounting and numbers.Classes allow for separate P&Ls for each property.

Today I would probably figure out to make money online with AI, that's an opportunity that did not exist in this form.

Been getting nowhere with zoning laws found online and in the local library for Yonkers (in westchester county) as to whether any permits are needed in order to operate such a business. 

When talking to property managers, ask questions regarding any guarantees they offer owners and refer to any online reviews to get a better idea of how tenants and other owners feel about working with the company.

Luckily I was in a buyer's market at the time, but about 75% of agents did not even respond to me and I could not set up appointments online because I was not a MLS member.   

And for anyone that would like to work with us please reach out before you believe everything you see online.

I have found no record of him online aside from self-published articles made to make them seem more reputable than they are.  

Quickbooks online could work for what you need.