For my personal portfolio I use a modified spreadsheet amortization by VERTEX, available in Google Docs.  

Obviously they are customized to what works for us but some our templates maybe helpful for you to modify for you. 

The law gets modified by case law.

Or should I grab plans from a local builder and work with their architect to modify the plans to more of my style?

@Nicholas AiolaI know the $25k PAL offset rules which will be phased out if MAGI (modified adjusted gross income) exceeds $150k.

We actually hired our own software engineers to modify the system for what we needed, and allowed the developer access to and property rights to what we developed in exchange for a long term license at low cost.  

Hold on, I have 2021/2022 on the phone for you, they're asking if you are interested in a 100 unit 1960's Vintage Multi-Fam property called  "The UnderWater" at a 3.5% Cap rate....Wait, Blackrock just said "Hold my Beer" and offered all cash at a 3Cap, something about subway tile Backsplash should double NOI in 3 months.perhaps modify "It is never a bad time to invest in real estate." to "at a good price". :) jus playin' It is all based on an individuals ability to invest in real estate in a ethical manner.

thanks for your time and help rent to retirement works directly with build to rent developers like us around the country once they are framed up. you are buying properties pretty much at market value but with a hand holding. you can work directly with a builder or directly with them. they are just an intermediary. they take 5% on what we make as a builder but have a large list of investors and a systemized approach to selling new builds. if you want to get a better deal I'd recommend directly contacting builders and building it yourself. fly to the market. spend 2 days, tour new builds, get a feeling for how it's going. if your builder isn't building multiple at a time then I wouldn't recommend working with them. rent to retirement is a well oiled and well run machine. they've had their ups and downs with dozens of transactions in florida but modified their process. they are well known and established and transparent. if you have a more specific market and feel confident in your ability to vet deals try it out. happy to talk more my info is in my signature. we work directly with them to sell new builds and no organization is perfect but I have good things to say about them as a builder and potential build to rent developer that sells build to rent triplexes and single family homes through them to end buyers in California like the Bay Area, Los Angeles, and San Diego 

Here are the notes I've received from other BP contributors, including Lisa Marie and Ke Nan Wang:Send a normal residential lease agreement to my attorney and he modifies it to implement the following:1.

Additionally, high-income earners with modified adjusted gross income (MAGI) over $250,000 (married filing jointly) may be subject to the 3.8% Net Investment Income Tax (NIIT).For 2025, bonus depreciation is at 40%, so consider leveraging it for eligible property assets like appliances or fixtures to accelerate deductions.