Here's a breakdown of the situation:Current Occupancy: 80% (16/20 units occupied).Current Gross Rent Roll: $14,265/month.Market Rent Potential: $17,665/month (100% occupancy).Renovation Needs: 15 units require full renovation ($10K/unit), 4 units are 75% renovated ($2.5K/unit), totaling $160K in renovation costs.Vacancy Loss: $41,820/year in lost income due to current vacancies.Cap Rate AnalysisThe seller lists the cap rate as 9.59%, but this is based on the projected NOI of $119,858 (assuming full occupancy and market rents).

Let the tenant vacate, and you have one month to find a replacement before you incur any losses.

I am left feeling that working with them was a wasted investment and decided to cut my losses and move on. 

K1s show your share of income or losses from the partnership, and you include it on your respective personal tax returns.Now, to your partners.

Most markets are competitive and a mere $10 a night could cause someone to book another property over yours which could cause vacancy and loss.

Here are some general guidelines: Lien Position1st Position LienEquityMinimum Down Payment of 20-25% (a 30% equity to sale price is preferred)Down Payment made in certified funds and not borrowedMaximum Funding of 70% ITV (Investment to Value)SeasoningMinimum of two monthly payments already made12 months or more preferredPayer CreditCredit Score of 650 or higherNo major derogatory trade lines (No 90-180+ days delinquent, foreclosure, repossession, bankruptcy, etc.)No decline in credit since purchase of businessTermsPrefer 60 months or lessMaximum of 72 monthsNo Balloon Payment preferredCash FlowBusiness has positive cash flow1.25 debt service coverage ratio preferred.DocumentationPersonal guarantee from a creditworthy individualStandard documents including Note, Security Agreement, and UCC-1 filing.Tax Returns on the business that substantiate profit and loss statements.OtherPayment history current and verifiablePayer Interview indicating buyer is satisfied with business and comfortable making paymentsMotivation for selling the note is not a result of a deteriorating businessConsideration of high risk businesses or geographic areasIn these situations, sometimes a partial is a better option. 

Focus on tax-saving strategies such as cost segregation studies and bonus depreciation to accelerate deductions.By qualifying as a Real Estate Professional (spending 750+ hours annually and materially participating), you can offset your wife’s S-Corp income with real estate losses, reducing your tax liability.

It's a small place so I'd guess it won't rent for enough to cover your expenses anyway so I'd probably sell, especially if the loss is small, it unless it's in a great neighborhood that you think will do well over time. 

A 50% decline in asset value would result in a $10,000 loss, double the loss of the unleveraged asset.  

Apparently, not only did they sell at a loss, I didn't get any money back at all and they claim I owe them an additional $40,000 for "renovations" despite no work being done to the building at all.