And I also do not like some characteristics of commercial loans such as balloon feature and higher rates etc.

We use AppFolio and love their accounting features.

I'm looking for a local banks that do portfolio lending in my local area LA and Orange County, CA. I don't know how to look for them.  I called many banks, they said they do traditional (1-4 units) or commercial loans...

Don’t, the message is to compare against other forum features and improve.  

I imagined Stessa would allow me to do this, but have not found this feature yet. 

@Brian Gerlach I looked into Guesty, but saw nothing in their feature list that was not covered by other solutions. 

Utilize the search feature if you can.

are there certain features of old buildings i should be more concerned with?

Therefore, the case was reopened and the story was featured on the news 2 weeks ago, including a 9 minute interview with the deceased man's daughter.

Buyer may, within 30 days (30 if not specified) from the Execution Date of this Agreement, conduct due diligence (Due Diligence Period), which includes, but is not limited to, verifying that the condition, permitted use, insurability, environmental conditions, boundaries, certifications, deed restrictions, zoning classifications and any other features of the Property are satisfactory.