Anyone who can provide useful advice would be appreciated.

I'll give you the secret to success, and if you truly follow this advice, you'll be happy and successful in life, whatever that is for you....

You might consider: Consulting a Real Estate Attorney – Your emails may possibly prove misrepresentation.Requesting Public Records – A FOIA request might reveal why the city denied you but later approved the duplex.Escalating to City Officials – Bringing this to local officials could expose inconsistencies.Exploring Tax Write-Offs – A CPA might help offset your financial loss, if it is possible.I’d definitely seek legal advice.

good advice, I listed it on BP classifieds. 

I’m eager to connect with experienced investors and would love any advice or mentorship on getting started, from financing and property selection to management strategies.Looking forward to learning from this community and contributing where I can!

Ideally, I would like to buy a 2-4 unit, but I'm not closed off to a single family and renting out the rooms.Any advice would be greatly appreciated!

Working in a busy property management company, I'm often asked for advice on camera and alarm systems, and in rougher neighborhoods sometimes it can be a toss-up on whether to keep a property boarded-up between showings. 

Any advice for a first time investor?

My advice for you is different than everyone else. 2 years ago I was in your shoes.

Andy advice is appreciated!