I am trying to assess whether I should take it solo , leave it or scout an experienced partner.

Given that I would pay 3/4 of the property's assessed value I think this could be a great opportunity.

Only with a definitive goal can you accurately assess your options.What I hear you saying is that you do want to build a rental portfolio. 

.- Creditworthiness: German banks assess your financial standing, so keeping accounts in good standing is critical.4.

Here are some indicators to help you assess a buyer's seriousness:Questions: Serious buyers will ask detailed questions about the property, such as maintenance costs, neighborhood amenities, and property taxesStrong Offer: If a buyer makes a strong offer quickly, it often indicates a high level of interest and intent to purchasePrivate Buyers: If approached by a private buyer, ensure they provide a Letter of Intent (LOI) and proof of funds.  

If they’re underfunded, you could get hit with special assessments.Not sure about the exact contract with the tenants, but I assume if there is any additional assessment, it would be tenants’ responsibility.Since you want to stay local and focus on cash flow, commercial makes sense, but have you considered industrial or flex space? 

Look for CPAs who stay abreast of evolving tax codes related to real estate and possess a comprehensive understanding of deductions, credits, and depreciation strategies unique to the industry. 

Quote from @Peter Firehock: Introduction:Well you've certainly put together a long and comprehensive analysis.   

Hello Alberto,Thank you so much for this great and comprehensive response. 

When I was assessing buyers, I wasn’t just looking at how much cash they had.