I ended up closing the line at 5.25%, interest only payments for 80% of what I paid for the deal.

Those willing to go beyond that could be good partners for real estate investors.Traditional banks/Local Banks and non-bank lenders - If they are a portfolio lender, meaning they actually hold on to the loan and don't just collect your payment, then they have the ability to be flexible.

Are some banks better for mortgages than others (in terms of down payment, interest rate, length of mortgage etc.)?

She can set up payments to be paid on the 1st of the month and no one is driving 24/7. 

However, I don’t yet have the funds for a down payment on another house, and I’m trying to figure out the best option for where to live while I rent the apartment.Do you have any recommendations for managing this transition or tips on finding a temporary place to stay?

Seller is the Agent.Seller bought property in January of 2023 for $730,000Current “As Is” Value : $770,000Target Acquisition Price: $730,000-$780,000 After Repaired Value: $900,000Repair Estimate: $120,000Initial Offer Amount: $715,000Loan Program: Bank Statement Program.Total Estimated Monthly Payments (Principal, Interest, Taxes, and Insurance) $5500/month (based on $770k purchase price)Estimated Gross Yearly Income from Short Term Rental: $160,000 (65% Occupancy, $700 a night| (STR Listing Comparable properties Listing 1 Listing 2 Listing 3)Net Monthly Income after management and taxes: $11,751.25Net Monthly Income after Mortgage Payments: $6251.25 ($75,015) Per YearTotal Cash Investment: $297,000 ($177,000 in down payment and closing costs and $120,000 in repairs)Average Yearly Return on Investment: 25% yearlyAverage increase in property value per year: 5%Average increase in booking revenue per year 7.5%Property Value average after 10 years: $1.5 millionTotal Cash received over 10 years: $1.3 million.Total Equity multiple min over 10 years: 6x total return on $297,000 invested.

Use the land as down payment on a construction loan.

though; (1) there are tenants in the house on a two year lease (payments are enough to cover mortgage payments), and (2) the Seller wants the option to buy back the property in two years.

The current owner listed last years income as $51,000, but currently has rents at (for the five separate units): $650, $750, $800, $825, $1125 (the math doesn't totally add up so maybe he changed a rent payment at some point). 

However you should consider if your loan has a Pre Payment Penalty.