If it is just one downstairs unit complaining while you may have a noise transmission issue the tenants might also not be suited to a multifamily. some people are more sensitive to noise and you may want to give them an out at some point.

I assume you want to reinvest this profit into another deal or use it for some other time-sensitive purpose.

I know having been a landlord for many years that this is not right, but clearly, may be a sensitive issue.

Here are some considerations:Pros of Using a Hard Money Lender:Speed: Compared to standard lenders, hard money lenders can provide quicker approval and financing processes, which lets you take advantage of time-sensitive possibilities.Flexibility: It may be simpler to obtain financing if HMLs are more accommodating when it comes to credit history and property condition standards.Access to Funds: You may take advantage of more investment opportunities by having quicker access to the equity in your property.Experience: For first-time investors in particular, certain hard money lenders offer invaluable experience and advice that can be helpful in navigating the fix and flip process.Cons of Using a Hard Money Lender:Greater Costs: Hard money loans might have interest rates and other costs that are greater than those associated with standard financing sources, which raises the project's total cost.Term Length: HMLs normally provide loan durations that are shorter, usually lasting between six months and a few years.

If there's a hole, it may be a red flag.b) sensitivity analysis: I examine all the assumptions, and make sure I can live with the worst case scenarios.c) "Stall and see": if they are getting money over multiple years, and there is no penalty for investing later, I would usually wait so I get some real performance data, versus having to look at theoretical pro forma information.d) Recession stress test: I will not invest in anything, until I subject it to recession level stress and see if I can live with the result.

They seem to work well to get more opens/attention and some get their panties in a tangle over it but it is what it is.If an email can piss some people off, I wonder how sensitive they are to anything that happens in the day to day life

  $3,000 for the first violation and $5,000 for every violation after.Some may not catch onto the first dozen of rental times with a STR flying under the radar but depending on how sensitive the market is to STRs, will determine how quickly that operator will be cited and shut down.

But you underwrite that into the deal.The area most people seem to struggle with is: a) commercial tenants are not as price sensitive as residential.  

I am very sensitive to this because I have people that are close to me that are in places like this.

Cameras are a must.Consult with your attorney about obtaining a restraining order against the individual.Without divulging too much information, let the neighbors know about the situation.