For example, you could use your $35,000 as part of a joint investment where both parties contribute either money or expertise.Creative Financing: Look into seller financing or other creative financing methods where the seller of the property helps to finance the purchase.

I believe your looking for a joint venture agreement right?

Each roommate/tenant was jointly responsible for the whole apartment as well.

They are jointly responsible for the lease.

Link for “ Investing in Real Estate Private Equity: An Insider’s Guide to Real Estate Partnerships, Funds, Joint Ventures & Crowdfunding" by Sean Cook

If all your roommates are also 30+ days, is it not unreasonable to draw up a joint lease between the people for the whole house? 

@Kelby Schimming - Raise the money from a partner or partners and joint venture the property via a shared LLC.

Some other options with the vacant lot include selling it off to a developer (what I would probably do) or finding a partner and rolling the lot into the project as your contribution to a joint venture.

Therefore, we will still be married for the tax year of 2024.Going forward this year I am not sure if we should file our taxes "married but jointly" or married but separately" for the tax year of 2023. 

You can find it here: https://lonestarlandlaw.com/partnerships-and-joint-ventures/