If you need financial help, ask under the "Finance, Tax, and Legal" forum.

He signed the paperwork (as did you) and legally he's responsible for paying it.

@Anthony Pollachioli THis is not a lender question, this is a legal question for a lawyer.

But I do wonder about the legal consequences of it.

Lots of legal opinions here, but most are inaccurate.It is true that, absent an estate planning vehicle (trust, etc.) there needs to be someone with “standing” who is empowered to pass title. 

I see you mention having an LLC, so I'll share my generic advice on that topic.An LLC is useful for two things: anonymity and legal protection.

(and yes I understand this will not constitute legal advice, just gathering information).

You're not a hard money lender (unless you are actually/legally one, then if you are I appologize). 

Security deposit amountYou can find plenty of examples by searching for "tenant estoppel certificate doc" or exchanging "doc" with "pdf" for more options.Here is an example and explanation: Sample EstoppelSome have a lot of legal jargon but this document does not need to be so detailed.

Ask about the maintenance history.Units: Visit as many individual units as possible to assess their condition and note any necessary repairs or updates.Structural Issues: Be vigilant about signs of water damage, mold, or pests, which could indicate larger problems.Safety Compliance: Verify that the property meets all local safety and building codes, including fire alarms, extinguishers, and emergency exits.Financial and Operational AspectsRent Roll: Request a detailed rent roll to understand current rents, lease terms, and tenant occupancy.Expenses: Get a breakdown of all operating expenses, including utilities, maintenance, insurance, property management fees, and taxes.Income Verification: Ask for historical income statements (preferably 12 months or more) to verify the revenue.Vacancy Rates: Inquire about the historical and current vacancy rates and how they compare to the market average.Tenant Profile: Understand the tenant mix, including residential versus commercial tenants, lease lengths, and tenant turnover rates.Property Management: Find out if the property is currently managed by a professional management company and if you will retain or replace them.Legal and ComplianceZoning Laws: Ensure the property complies with current zoning laws and inquire about any zoning changes that may affect the property.Rent Control: Determine if the property is subject to rent control or other regulations that could impact income.Permits and Licenses: Check that all necessary permits and licenses are up to date.Value-Add PotentialRenovation Opportunities: Identify areas where you could add value through renovations or upgrades.Rent Increases: Assess the potential for increasing rents based on market rates and property improvements.Additional Income: Explore opportunities for additional income streams, such as laundry facilities, parking fees, or storage rentals.Environmental ConsiderationsEnvironmental Hazards: Check for any environmental issues like asbestos, lead paint, or underground storage tanks.Flood Zones: Verify if the property is in a flood zone and the implications for insurance and risk.Questions to Ask the SellerReason for Selling: Understand the seller’s motivation to gauge the urgency and possible negotiation points.Recent Repairs and Improvements: Ask about any recent capital expenditures and future planned repairs.Tenant Relations: Inquire about the relationship with tenants and any ongoing disputes or issues.Due DiligenceProfessional Inspection: Hire a professional inspector to conduct a thorough examination of the property.Appraisal: Obtain an independent appraisal to verify the property’s market value.Legal Review: Have a real estate attorney review all contracts, leases, and legal documents related to the property.By covering these aspects, you’ll be in a stronger position to make an informed decision about your potential investment.